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<td valign="top" align="left" width="30%">Chapter 12. Compatibility With Other DBMS </td><td align="center" width="40%"><a accesskey="h" href="index.html"><img src="../images/db/home.png" alt="Home"></a></td><td valign="top" align="right" width="30%"> Chapter 14. HyperSQL Network Listeners
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<HR>
<div class="chapter" title="Chapter 13. Properties">
<div class="titlepage">
<div>
<div>
<h2 class="title">
<a name="dbproperties-chapt"></a>Chapter 13. Properties</h2>
</div>
<div>
<div class="authorgroup">
<div class="author">
<h3 class="author">
<span class="firstname">Fred</span> <span class="surname">Toussi</span>
</h3>
<div class="affiliation">
<span class="orgname">The HSQL Development Group<br>
</span>
</div>
</div>
</div>
</div>
<div>
<p class="releaseinfo">$Revision: 5481 $</p>
</div>
<div>
<div class="legalnotice" title="Legal Notice">
<a name="N14F32"></a>
<p>Copyright 2002-2015 Fred Toussi. Permission is granted to
distribute this document without any alteration under the terms of the
HSQLDB license. Additional permission is granted to the HSQL Development
Group to distribute this document with or without alterations under the
terms of the HSQLDB license.</p>
</div>
</div>
<div>
<p class="pubdate">2015-06-29 22:26:11-0400</p>
</div>
</div>
</div>
<div class="toc">
<p>
<b>Table of Contents</b>
</p>
<dl>
<dt>
<span class="section"><a href="dbproperties-chapt.html#dpc_connection_url">Connection URL</a></span>
</dt>
<dt>
<span class="section"><a href="dbproperties-chapt.html#dpc_variables_url">Variables In Connection URL</a></span>
</dt>
<dt>
<span class="section"><a href="dbproperties-chapt.html#dpc_connection_props">Properties for Individual Connections</a></span>
</dt>
<dt>
<span class="section"><a href="dbproperties-chapt.html#dpc_db_props_url">Properties for the Database</a></span>
</dt>
<dd>
<dl>
<dt>
<span class="section"><a href="dbproperties-chapt.html#dpc_sql_conformance">SQL Conformance Properties</a></span>
</dt>
<dt>
<span class="section"><a href="dbproperties-chapt.html#dpc_db_operations">Database Operations Properties</a></span>
</dt>
<dt>
<span class="section"><a href="dbproperties-chapt.html#dpc_db_file_mem">Database File and Memory Properties</a></span>
</dt>
<dt>
<span class="section"><a href="dbproperties-chapt.html#dpc_crypt_props">Crypt Properties</a></span>
</dt>
</dl>
</dd>
<dt>
<span class="section"><a href="dbproperties-chapt.html#dpc_system_props">System Properties</a></span>
</dt>
</dl>
</div>
<div class="section" title="Connection URL">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both">
<a name="dpc_connection_url"></a>Connection URL</h2>
</div>
</div>
</div>
<p>The normal method of accessing a HyperSQL catalog is via the JDBC
Connection interface. An introduction to different methods of providing
database services and accessing them can be found in the <a class="link" href="sqlgeneral-chapt.html" title="Chapter 2. SQL Language">SQL Language</a> chapter.
Details and examples of how to connect via JDBC are provided in our
JavaDoc for <code class="classname"><a class="classname" href="filelinks-app.html#JDBCConnection.html-link">
JDBCConnection</a></code>.</p>
<p>A uniform method is used to distinguish between different types of
connection. The common driver identifier is
<code class="literal">jdbc:hsqldb:</code> followed by a protocol identifier
(<code class="literal">mem: file: res: hsql: http: hsqls: https:</code>) then
followed by host and port identifiers in the case of servers, then
followed by database identifier. Additional property / value pairs can be
appended to the end of the URL, separated with semicolons.</p>
<div class="table">
<a name="N14F4B"></a>
<p class="title">
<b>Table 13.1. Memory Database URL</b>
</p>
<div class="table-contents">
<table summary="Memory Database URL" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col align="left" class="c1">
<col align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Driver and Protocol</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Host and Port Example</th><th style="border-bottom: 0.5pt solid ; " align="left">Database Example</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top">
<table summary="Simple list" border="0" class="simplelist">
<tr>
<td><code class="literal">jdbc:hsqldb:mem:</code></td>
</tr>
</table>
</td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top">not available</td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">
<table summary="Simple list" border="0" class="simplelist">
<tr>
<td><code class="literal">accounts</code></td>
</tr>
</table>
</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>Lowercase, single-word
identifier creates the in-memory database when the first
connection is made. Subsequent use of the same Connection URL
connects to the existing DB.</p>
<p>The old form for the
URL, <code class="literal">jdbc:hsqldb:.</code> creates or connects to the
same database as the new form for the URL,
<code class="literal">jdbc:hsqldb:mem:.</code>
</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N14F81"></a>
<p class="title">
<b>Table 13.2. File Database URL</b>
</p>
<div class="table-contents">
<table summary="File Database URL" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col align="left" class="c1">
<col align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Driver and Protocol</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Host and Port Example</th><th style="border-bottom: 0.5pt solid ; " align="left">Database Example</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top">
<table summary="Simple list" border="0" class="simplelist">
<tr>
<td><code class="literal">jdbc:hsqldb:file:</code></td>
</tr>
</table>
</td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top">not available</td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">
<table summary="Simple list" border="0" class="simplelist">
<tr>
<td><code class="literal">accounts</code></td>
</tr>
<tr>
<td><code class="literal">/opt/db/accounts</code></td>
</tr>
<tr>
<td><code class="literal">C:/data/mydb</code></td>
</tr>
</table>
</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The file path specifies the
database files. It should consist of a relative or absolute path
to the directory containing the database files, followed by a '/'
and the database name. In the above examples the first one refers
to a set of mydb.* files in the directory where the
<code class="literal">java</code>command for running the application was
issued. The second and third examples refer to absolute paths on
the host machine: For example, files named accounts.* in the
directory /opt/db for the accounts database.</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N14FB8"></a>
<p class="title">
<b>Table 13.3. Resource Database URL</b>
</p>
<div class="table-contents">
<table summary="Resource Database URL" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col align="left" class="c1">
<col align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Driver and Protocol</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Host and Port Example</th><th style="border-bottom: 0.5pt solid ; " align="left">Database Example</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top">
<table summary="Simple list" border="0" class="simplelist">
<tr>
<td><code class="literal">jdbc:hsqldb:res:</code></td>
</tr>
</table>
</td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top">not available</td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">
<table summary="Simple list" border="0" class="simplelist">
<tr>
<td><code class="literal">/adirectory/dbname</code></td>
</tr>
</table>
</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">Database files can be loaded from
one of the jars specified as part of the <code class="literal">Java</code>
command the same way as resource files are accessed in Java
programs. The <code class="literal">/adirectory</code> above stands for a
directory in one of the jars.</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N14FEB"></a>
<p class="title">
<b>Table 13.4. Server Database URL</b>
</p>
<div class="table-contents">
<table summary="Server Database URL" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col align="left" class="c1">
<col align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Driver and Protocol</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Host and Port Example</th><th style="border-bottom: 0.5pt solid ; " align="left">Database Example</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top">
<table summary="Simple list" border="0" class="simplelist">
<tr>
<td><code class="literal">jdbc:hsqldb:hsql:</code></td>
</tr>
<tr>
<td><code class="literal">jdbc:hsqldb:hsqls:</code></td>
</tr>
<tr>
<td><code class="literal">jdbc:hsqldb:http:</code></td>
</tr>
<tr>
<td><code class="literal">jdbc:hsqldb:https:</code></td>
</tr>
</table>
</td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top">
<table summary="Simple list" border="0" class="simplelist">
<tr>
<td><code class="literal">//localhost</code></td>
</tr>
<tr>
<td><code class="literal">//192.0.0.10:9500</code></td>
</tr>
<tr>
<td><code class="literal">//dbserver.somedomain.com</code></td>
</tr>
</table>
</td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">
<table summary="Simple list" border="0" class="simplelist">
<tr>
<td><code class="literal">/an_alias</code></td>
</tr>
<tr>
<td><code class="literal">/enrolments</code></td>
</tr>
<tr>
<td><code class="literal">/quickdb</code></td>
</tr>
</table>
</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The host and port specify
the IP address or host name of the server and an optional port
number. The database to connect to is specified by an alias. This
alias is a lowercase string defined in the
<code class="filename">server.properties</code> file to refer to an actual
database on the file system of the server or a transient,
in-memory database on the server. The following example lines in
<code class="filename">server.properties</code> or
<code class="filename">webserver.properties</code> define the database
aliases listed above and accessible to clients to refer to
different file and in-memory databases.</p>
<p>The old form
for the server URL, e.g.,
<code class="literal">jdbc:hsqldb:hsql//localhost</code> connects to the
same database as the new form for the URL,
<code class="literal">jdbc:hsqldb:hsql//localhost/</code> where the alias is
a zero length string.</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
</div>
<div class="section" title="Variables In Connection URL">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both">
<a name="dpc_variables_url"></a>Variables In Connection URL</h2>
</div>
</div>
</div>
<p>Two types of variables are allowed for file: database URLs. These
properties have an effect only if used for the first connection to the
database (the connection which opens the database). When running a server,
these variables have no effect on the connection URL but can be appended
to the database path URL in server.properties or the server command
line.</p>
<p>If the database part of a file: database begins with
<code class="literal">~/</code> or <code class="literal">~\</code> the tilde character is
replaced with the value of the system property
<code class="literal">"user.home"</code> resulting in the database being created or
accessed in this directory, or one of its subdirectories. In the examples
below, the database files for <code class="literal">mydb</code> and
<code class="literal">filedb</code> are located in the user's home directory.</p>
<pre class="programlisting"> jdbc:hsqldb:file:~/mydb
jdbc:hsqldb:file:~/filedb;shutdown=true
</pre>
<p>If the database URL contains a string in the form of
<code class="literal">${propname}</code> then the sequence of characters is replaced
with the system property with the given name. For example you can use this
in the URL of a database that is used in a web application and define the
system property, "propname" in the web application properties. In the
example below, the string <code class="literal">${mydbpath}</code> is replaced with
the value of the property, <code class="literal">mydbpath</code>
</p>
<pre class="programlisting"> jdbc:hsqldb:file:${mydbpath}</pre>
</div>
<div class="section" title="Properties for Individual Connections">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both">
<a name="dpc_connection_props"></a>Properties for Individual Connections</h2>
</div>
</div>
</div>
<p>Each JDBC Connection to a database can specify connection
properties. The properties <span class="property">user</span> and
<span class="property">password</span> are always required. The following optional
properties can also be used.</p>
<p>Connection properties are specified either by establishing the
connection via the method call below, or the property can be appended to
the full Connection URL. The first three of these properties can be used
for any connection, including connection to a Server but the other three
have an effect only with the first connection to a file: or mem: database,
or when appended to the database path URL in server.properties or the
server command line.</p>
<pre class="programlisting"> DriverManager.getConnection (String url, Properties info);</pre>
<div class="table">
<a name="N15079"></a>
<p class="title">
<b>Table 13.5. User and Password</b>
</p>
<div class="table-contents">
<table summary="User and Password" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">user</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">SA</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">user name</td>
</tr>
<tr>
<td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top">
<p>Standard property. This
property is case sensitive. Example below:</p>
<pre class="programlisting"> jdbc:hsqldb:file:enrolments;user=aUserName;ifexists=true</pre>
</td>
</tr>
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">password</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">empty string</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">password for the user</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>Standard property. This
property is case sensitive. Example below:</p>
<pre class="programlisting"> jdbc:hsqldb:file:enrolments;user=aUserName;password=3xLVz</pre>
<p>For
compatibility with other engines, a non-standard form of
specifying user and password is also supported. In this form, user
name and password appear at the end of the URL string, prefixed
respectively with the question mark and the
ampersand:</p>
<pre class="programlisting"> jdbc:hsqldb:file:enrolments;create=false?user=aUserName&password=3xLVz</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N150BA"></a>
<p class="title">
<b>Table 13.6. Closing old ResultSet when Statement is reused</b>
</p>
<div class="table-contents">
<table summary="Closing old ResultSet when Statement is reused" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="7cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">close_result</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">closing the old result set when a new ResultSet is created
by a Statement</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property is used for
compatibility with the JDBC specification. When true (the JDBC
specification), a <code class="classname">ResultSet</code> that was
previously returned by executing a
<code class="classname">Statement</code> or
<code class="classname">PreparedStatement</code> is closed as soon as the
<code class="classname">Statement</code> is executed
again.</p>
<p>The default is false as previous versions of
HSQLDB did not close old result set. The user application should
close old result sets when they are no longer needed and should
not rely on auto-closing side effect of executing the
Statement.</p>
<p>The default is false. When the property is
true, the old <code class="classname">ResultSet</code> is closed when a
<code class="classname">Statement</code> is re-executed. Example
below:</p>
<pre class="programlisting"> jdbc:hsqldb:hsql://localhost/enrolments;close_result=true</pre>
<p>When
a <code class="classname">ResultSet</code> is used inside a user-defined
stored procedure, the default, false, is always used for this
property.</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15101"></a>
<p class="title">
<b>Table 13.7. Column Names in JDBC ResultSet</b>
</p>
<div class="table-contents">
<table summary="Column Names in JDBC ResultSet" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="7cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">get_column_name</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">column name in ResultSet</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property is used for
compatibility with other JDBC driver implementations. When true
(the default), <code class="methodname">ResultSet.getColumnName(int
c)</code> returns the underlying column name. This property
can be specified differently for different connections to the same
database.</p>
<p>The default is true. When the property is
false, the above method returns the same value as
<code class="methodname">ResultSet.getColumnLabel(int column)</code>
Example below:</p>
<pre class="programlisting"> jdbc:hsqldb:hsql://localhost/enrolments;get_column_name=false</pre>
<p>When
a <code class="classname">ResultSet</code> is used inside a user-defined
stored procedure, the default, true, is always used for this
property.</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N1513A"></a>
<p class="title">
<b>Table 13.8. Creating New Database</b>
</p>
<div class="table-contents">
<table summary="Creating New Database" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">ifexists</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">connect only if database already exists</td>
</tr>
<tr>
<td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top">
<p>Has an effect only with
<em class="glossterm">mem:</em> and <em class="glossterm">file:</em>
database. When true, will not create a new database if one does
not already exist for the URL.</p>
<p>When the property is
false (the default), a new <em class="glossterm">mem:</em> or
<em class="glossterm">file:</em> database will be created if it does
not exist.</p>
<p>Setting the property to true is useful when
troubleshooting as no database is created if the URL is malformed.
Example below:</p>
<pre class="programlisting"> jdbc:hsqldb:file:enrolments;ifexists=true</pre>
</td>
</tr>
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">create</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">create the database if it does not exist</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>Similar to the ifexists
property, but with opposite meaning.</p>
<p>Has an effect
only with <em class="glossterm">mem:</em> and
<em class="glossterm">file:</em> database. When false, will not create
a new database if one does not already exist for the
URL.</p>
<p>When the property is true (the default), a new
<em class="glossterm">mem:</em> or <em class="glossterm">file:</em>
database will be created if it does not exist.</p>
<p>Setting
the property to true is useful when troubleshooting as no database
is created if the URL is malformed. Example
below:</p>
<pre class="programlisting"> jdbc:hsqldb:file:enrolments;create=false</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15199"></a>
<p class="title">
<b>Table 13.9. Automatic Shutdown</b>
</p>
<div class="table-contents">
<table summary="Automatic Shutdown" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">shutdown</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">shut down the database when the last connection is
closed</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>If this property is
<code class="literal">true</code>, when the last connection to a database is
closed, the database is automatically shut down. The property
takes effect only when the first connection is made to the
database. This means the connection that opens the database. It
has no effect if used with subsequent
connections.</p>
<p>This command has two uses. One is for
test suites, where connections to the database are made from one
JVM context, immediately followed by another context. The other
use is for applications where it is not easy to configure the
environment to shutdown the database. Examples reported by users
include web application servers, where the closing of the last
connection coincides with the web app being shut
down.</p>
<pre class="programlisting"> jdbc:hsqldb:file:enrolments;shutdown=true</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<p>In addition, when the first connection to an
<em class="glossterm">in-process</em> <code class="literal">file:</code> or
<code class="literal">mem:</code> database creates a new database all the
user-defined database properties can be specified as URL properties. See
the next section for details.</p>
</div>
<div class="section" title="Properties for the Database">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both">
<a name="dpc_db_props_url"></a>Properties for the Database</h2>
</div>
</div>
</div>
<p>Each database has several default settings (properties) that are
listed in the <a class="link" href="management-chapt.html" title="Chapter 11. System Management">System Management</a> chapter. These properties can be
changed via SQL commands after a connection is made to the database. It is
possible to specify most of these properties in the connection properties
or as part of the URL string when the first connection is made to a new
<code class="literal">file:</code> or <code class="literal">mem:</code> database. This allows
the properties to be set without using any SQL commands. The corresponding
SQL command is given for each property. For a server, these properties can
be appended to the database path URL in server.properties or the server
command line.</p>
<p>Note the prefered method of setting database properties is by using
a set of SQL statements. These statements can be used both for a new
database or an existing database, unlike URL properties that are generally
effective for new databases only.</p>
<p>If the properties are used for connection to an existing database,
they are ignored.</p>
<p>The exceptions are the following property settings that are allowed
for the first connection to an existing database (the connection which
reopens the database): <code class="literal">readonly=true</code>,
<code class="literal">files_readonly=true</code>,
<code class="literal">hsqldb.lock_file=false</code>,
<code class="literal">hsqldb.sqllog=1-3</code>,
<code class="literal">hsqldb.applog=1-3</code>. These specific property / value
pairs override the existing database properties. For example a normal
database is opened as readonly, or the lock file is not created, or the
sql log level is set to a value between 1 and 3.</p>
<p>Management of properties has changed since version 1.8. The old SET
PROPERTY statement does not change a property and is ignored. The
statement is retained to simplify application upgrades.</p>
<p>In the example URL below, two properties are set for the first
connection to a new database.</p>
<pre class="programlisting"> jdbc:hsqldb:file:enrolments;hsqldb.cache_rows=10000;hsqldb.nio_data_file=false</pre>
<p>In the table below, database properties that can be used as part of
the URL or in connection properties are listed. For each property that can
also be set with an SQL statement, the statement is also given. These
statements are described more extensively in the <a class="link" href="management-chapt.html" title="Chapter 11. System Management">System Management</a>
chapter.</p>
<div class="table">
<a name="N15206"></a>
<p class="title">
<b>Table 13.10. Validity Check Property</b>
</p>
<div class="table-contents">
<table summary="Validity Check Property" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">check_props</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">checks the validity of the connection properties</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>If the property is true,
every database property that is specified on the URL or in
connection properties is checked and if it is not used correctly,
an error is returned.</p>
<pre class="programlisting">this property cannot be set with an SQL statement</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="section" title="SQL Conformance Properties">
<div class="titlepage">
<div>
<div>
<h3 class="title">
<a name="dpc_sql_conformance"></a>SQL Conformance Properties</h3>
</div>
</div>
</div>
<div class="table">
<a name="N15237"></a>
<p class="title">
<b>Table 13.11. SQL Keyword Use as Identifier</b>
</p>
<div class="table-contents">
<table summary="SQL Keyword Use as Identifier" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.enforce_names</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">enforcing SQL keywords</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property, when set
true, prevents SQL keywords being used for database object names
such as columns and tables.</p>
<pre class="programlisting">SET DATABASE SQL NAMES { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15264"></a>
<p class="title">
<b>Table 13.12. SQL Keyword Starting with the Underscore or Containing Dollar
Characters</b>
</p>
<div class="table-contents">
<table summary="SQL Keyword Starting with the Underscore or Containing Dollar
Characters" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.regular_names</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">enforcing SQL keywords</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property, when set
true, prevents database object names such as columns and tables
beginning with the underscore or containing the dollar
character.</p>
<pre class="programlisting">SET DATABASE SQL REGULAR NAMES { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15291"></a>
<p class="title">
<b>Table 13.13. Reference to Columns Names</b>
</p>
<div class="table-contents">
<table summary="Reference to Columns Names" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.enforce_refs</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">enforcing column reference disambiguation</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property, when set
true, causes an error when an SQL statement (usually a select
statement) contains column references that can be resolved by
more than one table name or alias. In effect forces such column
references to have a table name or table alias
qualifier.</p>
<pre class="programlisting">SET DATABASE SQL REFERENCES { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N152BE"></a>
<p class="title">
<b>Table 13.14. String Size Declaration</b>
</p>
<div class="table-contents">
<table summary="String Size Declaration" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.enforce_size</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">size enforcement of string columns</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>Conforms to SQL standards
for size and precision of data types. When true, all VARCHAR
column type declarations require a size. When the property is
false and there is no size in the declaration, a default size is
used. Note that all other types accept a declaration without a
size, which is interpreted as a default
size.</p>
<pre class="programlisting">SET DATABASE SQL SIZE { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N152EB"></a>
<p class="title">
<b>Table 13.15. Type Enforcement in Comparison and Assignment</b>
</p>
<div class="table-contents">
<table summary="Type Enforcement in Comparison and Assignment" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.enforce_types</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">enforcing type compatibility</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property, when set
true, causes an error when an SQL statements contains
comparisons or assignments that are non-standard due to type
mismatch. Most illegal comparisons and assignments will cause an
exception regardless of this setting. This setting applies to a
small number of comparisons and assignments that are possible,
but not standard conformant, and were allowed in previous
versions of HSQLDB.</p>
<pre class="programlisting">SET DATABASE SQL TYPES { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15318"></a>
<p class="title">
<b>Table 13.16. Foreign Key Triggered Data Change</b>
</p>
<div class="table-contents">
<table summary="Foreign Key Triggered Data Change" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.enforce_tdc_delete</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">enforcing triggered data change violation for
deletes</td>
</tr>
<tr>
<td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top">
<p>The ON DELETE and ON
UPDATE clauses of constraints cause data changes in rows in
different tables or the same table. When there are multiple
constraints, a row may be updated by one constraint and deleted
by another constraint in the same operation. This is not allowed
by default. Changing this property to false allows such
violations of the Standard to pass without an exception. Used
for porting from database engines that do not enforce the
constraints.</p>
<pre class="programlisting">SET DATABASE SQL TDC DELETE { TRUE | FALSE }</pre>
</td>
</tr>
<tr>
<td style="border-bottom: 0.5pt solid ; " colspan="3" align="left" valign="top"> </td>
</tr>
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.enforce_tdc_update</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">enforcing triggered data change violation for
updates</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The ON DELETE and ON
UPDATE clauses of foreign key constraints cause data changes in
rows in different tables or the same table. With multiple
constraint, a field may be updated by two constraints and set to
different values. This is not allowed by default. Changing this
property to false allows such violations of the Standard to pass
without an exception. Used for porting from database engines
that do not enforce the constraints
properly.</p>
<pre class="programlisting">SET DATABASE SQL TDC UPDATE { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N1535B"></a>
<p class="title">
<b>Table 13.17. Use of LOB for LONGVAR Types</b>
</p>
<div class="table-contents">
<table summary="Use of LOB for LONGVAR Types" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.longvar_is_lob</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">translating longvarchar and longvarbinary to lob</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property, when set
true, causes type declarations using LONGVARCHAR and
LONGVARBINARY to be translated to CLOB and BLOB respectively. By
default, they are translated to VARCHAR and
VARBINARY.</p>
<pre class="programlisting">SET DATABASE SQL LONGVAR IS LOB { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15388"></a>
<p class="title">
<b>Table 13.18. Concatenation with NULL</b>
</p>
<div class="table-contents">
<table summary="Concatenation with NULL" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.concat_nulls</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">behaviour of concatenation involving one null</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property, when set
false, causes the concatenation of a null and a not null value
to return the not null value. By default, it returns
null.</p>
<pre class="programlisting">SET DATABASE SQL CONCAT NULLS { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N153B5"></a>
<p class="title">
<b>Table 13.19. NULL in Multi-Column UNIQUE Constraints</b>
</p>
<div class="table-contents">
<table summary="NULL in Multi-Column UNIQUE Constraints" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.unique_nulls</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">behaviour of multi-column UNIQUE constraints with null
values</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property, when set
false, causes multi-column unique constrains to be more
restrictive for value sets that contain a mix of null and not
null values.</p>
<pre class="programlisting">SET DATABASE SQL UNIQUE NULLS { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N153E2"></a>
<p class="title">
<b>Table 13.20. Truncation or Rounding in Type Conversion</b>
</p>
<div class="table-contents">
<table summary="Truncation or Rounding in Type Conversion" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.convert_trunc</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">behaviour of type conversion from DOUBLE to integral
types</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property, when set
false, causes type conversions from DOUBLE to any integral type
to use rounding. By default truncation is
used.</p>
<pre class="programlisting">SET DATABASE SQL CONVERT TRUNCATE { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N1540F"></a>
<p class="title">
<b>Table 13.21. Decimal Scale of Division and AVG Values</b>
</p>
<div class="table-contents">
<table summary="Decimal Scale of Division and AVG Values" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.avg_scale</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">0</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">decimal scale of values returned by division and the AVG
and MEDIAN aggregate functions</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>By default, the result of
a division or an AVG or MEDIAN aggregate has the same type and
scale as the aggregated value. For INTEGER types, the scale is
0. When this property is set to a value other than the default
0, then the scale is used if it is greater than the scale of the
divisor or aggregated value. This property does not affect
DOUBLE values. Values between 0 - 10 can be used for this
property.</p>
<pre class="programlisting">SET DATABASE SQL AVG SCALE <numeric value></pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N1543C"></a>
<p class="title">
<b>Table 13.22. Support for NaN values</b>
</p>
<div class="table-contents">
<table summary="Support for NaN values" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.double_nan</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">behaviour of expressions returning DOUBLE NaN</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property, when set
false, causes division of DOUBLE values by Zero to return a
Double.NaN value. By default an exception is
thrown.</p>
<pre class="programlisting">SET DATABASE SQL DOUBLE NAN { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15469"></a>
<p class="title">
<b>Table 13.23. Sort order of NULL values</b>
</p>
<div class="table-contents">
<table summary="Sort order of NULL values" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.nulls_first</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">ordering of NULL values</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>By default, nulls appear
before not-null values when a result set is ordered without
specifying NULLS FIRST or NULLS LAST. This property, when set
false, causes nulls to appear by default after not-null values
in result sets with ORDER BY</p>
<pre class="programlisting">SET DATABASE SQL NULLS FIRST { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15496"></a>
<p class="title">
<b>Table 13.24. Sort order of NULL values with DESC</b>
</p>
<div class="table-contents">
<table summary="Sort order of NULL values with DESC" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.nulls_order</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">ordering of NULL values when DESC is used</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>By default, when an ORDER
BY clause that does not specify NULLS FIRST or NULLS LAST is
used, nulls are ordered according to the
<code class="literal">sql.nulls_first</code> setting even when DESC is
used after ORDER BY. This property, when set false, causes nulls
to appear in the opposite position when DESC is
used.</p>
<pre class="programlisting">SET DATABASE SQL NULLS ORDER { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N154C6"></a>
<p class="title">
<b>Table 13.25. String comparison with padding</b>
</p>
<div class="table-contents">
<table summary="String comparison with padding" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.pad_space</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">ordering of strings with trailing spaces</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>By default, when two
strings are compared, he shorter string is padded with spaces
before comparison. When this property is set false, no padding
takes place before comparison. Without padding, the shorter
string is never equal to the longer one.</p>
<p>Before
version 2.0, HSQLDB used NO PAD comparison. If you need the old
behaviour, use this property when opening an older
database.</p>
<pre class="programlisting">SET DEFAULT COLLATION <collation name> [ NO PAD | PAD SPACE ]</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N154F5"></a>
<p class="title">
<b>Table 13.26. Case Insensitive Varchar columns</b>
</p>
<div class="table-contents">
<table summary="Case Insensitive Varchar columns" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.ignore_case</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">case-insensitive VARCHAR</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>When this propery is set
true, all VARCHAR declarations in CREATE TABLE and other
statemenst are assigned an Upper Case Comparison collation,
SQL_TEXT_UCC. This is designed for compatibility with some
databases that use case-insensitive comparison. It is better to
specify the collation selectively for specific columns that
require it.</p>
<pre class="programlisting">SET DATABASE COLLATION SQL_TEXT_UCC</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15522"></a>
<p class="title">
<b>Table 13.27. DB2 Style Syntax</b>
</p>
<div class="table-contents">
<table summary="DB2 Style Syntax" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.syntax_db2</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">support for DB2 style syntax</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property, when set
true, allows compatibility with some aspects of this dialect.
</p>
<pre class="programlisting">SET DATABASE SQL SYNTAX DB2 { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N1554E"></a>
<p class="title">
<b>Table 13.28. MSSQL Style Syntax</b>
</p>
<div class="table-contents">
<table summary="MSSQL Style Syntax" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.syntax_mss</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">support for MS SQL Server style syntax</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property, when set
true, switches the arguments of the CONVERT function and also
allow compatibility with some other aspects of this dialect.
</p>
<pre class="programlisting">SET DATABASE SQL SYNTAX MSS { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N1557A"></a>
<p class="title">
<b>Table 13.29. MySQL Style Syntax</b>
</p>
<div class="table-contents">
<table summary="MySQL Style Syntax" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.syntax_mys</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">support for MySQL style syntax</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property, when set
true, enables support for TEXT and AUTO_INCREMENT types and also
allow compatibility with some other aspects of this
dialect.</p>
<pre class="programlisting">SET DATABASE SQL SYNTAX MYS { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N155A7"></a>
<p class="title">
<b>Table 13.30. Oracle Style Syntax</b>
</p>
<div class="table-contents">
<table summary="Oracle Style Syntax" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.syntax_ora</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">support for Oracle style syntax</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property, when set
true, enables support for non-standard types. It also enables
DUAL, ROWNUM, NEXTVAL and CURRVAL syntax and and also allow
compatibility with some other aspects of this
dialect.</p>
<pre class="programlisting">SET DATABASE SQL SYNTAX ORA { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N155D4"></a>
<p class="title">
<b>Table 13.31. PostgreSQL Style Syntax</b>
</p>
<div class="table-contents">
<table summary="PostgreSQL Style Syntax" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">sql.syntax_pgs</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">support for PostgreSQL style syntax</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property, when set
true, enables support for TEXT and SERIAL types. It also enables
NEXTVAL, CURRVAL and LASTVAL syntax and also allow compatibility
with some other aspects of this dialect.</p>
<pre class="programlisting">SET DATABASE SQL SYNTAX PGS { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
</div>
<div class="section" title="Database Operations Properties">
<div class="titlepage">
<div>
<div>
<h3 class="title">
<a name="dpc_db_operations"></a>Database Operations Properties</h3>
</div>
</div>
</div>
<div class="table">
<a name="N15604"></a>
<p class="title">
<b>Table 13.32. Default Table Type</b>
</p>
<div class="table-contents">
<table summary="Default Table Type" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.default_table_type</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">memory</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">type of table created with unqualified CREATE
TABLE</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The CREATE TABLE command
results in a MEMORY table by default. Setting the value
<span class="emphasis"><em>cached</em></span> for this property will result in a
cached table by default. The qualified forms such as CREATE
MEMORY TABLE or CREATE CACHED TABLE are not affected at all by
this property.</p>
<pre class="programlisting">SET DATABASE DEFAULT TABLE TYPE { CACHED | MEMORY }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15634"></a>
<p class="title">
<b>Table 13.33. Transaction Control Mode</b>
</p>
<div class="table-contents">
<table summary="Transaction Control Mode" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.tx</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">locks</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">database transaction control mode</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>Indicates the transaction
control mode for the database. The values, locks, mvlocks and
mvcc are allowed.</p>
<pre class="programlisting">SET DATABASE TRANSACTION CONTROL { LOCKS | MVLOCKS | MVCC }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15661"></a>
<p class="title">
<b>Table 13.34. Default Isolation Level for Sessions</b>
</p>
<div class="table-contents">
<table summary="Default Isolation Level for Sessions" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.tx_level</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">read_commited</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">database default transaction isolation level</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>Indicates the default
transaction isolation level for each new session. The values,
read_committed and serializable are allowed. Individual sessions
can change their isolation level.</p>
<pre class="programlisting">SET DATABASE DEFAULT ISOLATION LEVEL { READ COMMITTED | SERIALIZABLE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N1568E"></a>
<p class="title">
<b>Table 13.35. Transaction Rollback in Deadlock</b>
</p>
<div class="table-contents">
<table summary="Transaction Rollback in Deadlock" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.tx_conflict_rollback</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">effect of deadlock or other conflicts on
transaction</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>When a transaction
deadlock or other unresolvable conflict is about to happen, the
current transaction is rolled back and an exception is raised.
When this property is set false, the transaction is not rolled
back. Only the latest action that would cause the conflict is
undone and an error is returned. The property should not be
changed unless the application can quickly perform an
alternative statement and complete the transaction. It is
provided for compatibility with other database engines which do
not roll back the transaction upon
deadlock.</p>
<pre class="programlisting">SET DATABASE TRANSACTION ROLLBACK ON CONFLICT { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N156BB"></a>
<p class="title">
<b>Table 13.36. Time Zone and Interval Types</b>
</p>
<div class="table-contents">
<table summary="Time Zone and Interval Types" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.translate_tti_types</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">usage of type codes for advanced datetime and interval
types</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>If the property is true,
the TIME / TIMESTAMP WITH TIME ZONE types and INTERVAL types are
represented in JDBC methods of
<code class="classname">ResultSetMetaData</code> and
<code class="classname">DatabaseMetaData</code> as JDBC datetime types
without time zone and the VARCHAR type respectively. The
original type names are preserved.</p>
<pre class="programlisting">SET DATABASE SQL TRANSLATE TTI TYPES { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
</div>
<div class="section" title="Database File and Memory Properties">
<div class="titlepage">
<div>
<div>
<h3 class="title">
<a name="dpc_db_file_mem"></a>Database File and Memory Properties</h3>
</div>
</div>
</div>
<div class="table">
<a name="N156F2"></a>
<p class="title">
<b>Table 13.37. Opening Database as Read Only</b>
</p>
<div class="table-contents">
<table summary="Opening Database as Read Only" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">readonly</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">readonly database - is used to open an existing
<code class="literal">file:</code> database</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property is a special
property that can be added manually to the .properties file, or
included in the URL or connection properties. When this property
is true, the database becomes readonly. This can be used with an
existing database to open it for readonly
operation.</p>
<pre class="programlisting">this property cannot be set with an SQL statement - it can be used in the .properties file</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15722"></a>
<p class="title">
<b>Table 13.38. Opening Database Without Modifying the Files</b>
</p>
<div class="table-contents">
<table summary="Opening Database Without Modifying the Files" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">files_readonly</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">readonly files database - is used to open an existing
<code class="literal">file:</code> database</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property is used
similarly to the hsqldb.readonly property. When this property is
true, CACHED and TEXT tables are readonly but memory tables are
not. Any change to the data is not persisted to database
files.</p>
<pre class="programlisting">this property cannot be set with an SQL statement - it can be used in the .properties file</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15752"></a>
<p class="title">
<b>Table 13.39. Huge database files and tables</b>
</p>
<div class="table-contents">
<table summary="Huge database files and tables" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.large_data</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">enable huge database files - can also be used to open an
existing <code class="literal">file:</code> database</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>By default, up to 2
billion rows can be stored in disk-based CACHED tables. Setting
this property to true increases the limit to 256 billion rows.
This property is used as a connection
property.</p>
<pre class="programlisting">this property cannot be set with an SQL statement - it can be used as a connection property for the connection that opens the database</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15782"></a>
<p class="title">
<b>Table 13.40. Event Logging</b>
</p>
<div class="table-contents">
<table summary="Event Logging" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.applog</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">0</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">application logging level - can also be used when
openning an existing <code class="literal">file:</code> database</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The default level 0
indicates no logging. Level 1 results in minimal logging,
including any failures. Level 2 indicates all events, including
ordinary events. LEVEL 3 adds details of some of the normal
operations. The events are logged in a file ending with
".app.log".</p>
<pre class="programlisting">SET DATABASE EVENT LOG LEVEL { 0 | 1 | 2 | 3}</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N157B2"></a>
<p class="title">
<b>Table 13.41. SQL Logging</b>
</p>
<div class="table-contents">
<table summary="SQL Logging" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.sqllog</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">0</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">sql logging level - can also be used when openning an
existing <code class="literal">file:</code> database</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The default level 0
indicates no logging. Level 1 logs only commits and rollbacks.
Level 2 logs all the SQL statements executed, together with
their parameter values. Long statements and parameter values are
truncated. Level 3 is similar to Level 2 but does not truncate
long statements and values. The events are logged in a file
ending with ".sql.log". This property applies to existing file:
databases as well as new databases.</p>
<pre class="programlisting">SET DATABASE EVENT LOG SQL LEVEL { 0 | 1 | 2 | 3}</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N157E2"></a>
<p class="title">
<b>Table 13.42. Temporary Result Rows in Memory</b>
</p>
<div class="table-contents">
<table summary="Temporary Result Rows in Memory" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.result_max_memory_rows</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">0</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">storage of temporary results and tables in memory or on
disk</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property can be set
to specify how many rows of each results or temporary table are
stored in memory before the table is written to disk. The
default is zero and means data is always stored in memory. If
this setting is used, it should be set above
1000.</p>
<pre class="programlisting">SET DATABASE DEFAULT RESULT MEMORY ROWS <numeric value></pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N1580F"></a>
<p class="title">
<b>Table 13.43. Rows Cached In Memory</b>
</p>
<div class="table-contents">
<table summary="Rows Cached In Memory" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.cache_free_count</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">512</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">maximum number of unused space recovery - can also be
used when openning an existing <code class="literal">file:</code>
database</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The default indicates 512
unused spaces are kept for later use. The value can range
between 0 - 8096. </p>
<p>When rows are deleted, the space
is recovered and kept for reuse for new rows. If too many rows
are deleted, the smaller recovered spaces are lost and the
largest ones are retained for later use. Normally there is no
need to set this property.</p>
<pre class="programlisting">this property cannot be set with an SQL statement</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15841"></a>
<p class="title">
<b>Table 13.44. Rows Cached In Memory</b>
</p>
<div class="table-contents">
<table summary="Rows Cached In Memory" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.cache_rows</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">50000</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">maximum number of rows in memory cache</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>Indicates the maximum
number of rows of cached tables that are held in
memory.</p>
<p>The value can range between 100- 4 billion.
If the value is set via SET FILES CACHE ROWS then it becomes
effective after the next database
SHUTDOWN.</p>
<pre class="programlisting">SET FILES CACHE ROWS <numeric value></pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15870"></a>
<p class="title">
<b>Table 13.45. Size of Rows Cached in Memory</b>
</p>
<div class="table-contents">
<table summary="Size of Rows Cached in Memory" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.cache_size</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">10000</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">memory cache size</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>Indicates the total size
(in kilobytes) of rows in the memory cache used with cached
tables. This size is calculated as the binary size of the rows,
for example an INTEGER is 4 bytes. The actual memory size used
by the objects is 2 to 4 times this value. This depends on the
types of objects in database rows, for example with binary
objects the factor is less than 2, with character strings, the
factor is just over 2 and with date and timestamp objects the
factor is over 3.</p>
<p>The value can range between 100 KB
- 4 GB. The default is 10,000, representing 10,000 kilobytes. If
the value is set via SET FILES then it becomes effective after
the next database SHUTDOWN or
CHECKPOINT.</p>
<pre class="programlisting">SET FILES CACHE SIZE <numeric value></pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N1589F"></a>
<p class="title">
<b>Table 13.46. Size Scale of Disk Table Storage</b>
</p>
<div class="table-contents">
<table summary="Size Scale of Disk Table Storage" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.cache_file_scale</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">32</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">unit used for storage of rows in the .data file</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The default value
corresponds to a maximum size of 64 GB for the .data file. This
can be increased to 64, 128, 256, 512, or 1024 resulting in up
to 2 TB GB storage. Settings below 32 in older databases are
preserved until a SHUTDOWN COMPACT.</p>
<pre class="programlisting">SET FILES SCALE <numeric value></pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N158CC"></a>
<p class="title">
<b>Table 13.47. Size Scale of LOB Storage</b>
</p>
<div class="table-contents">
<table summary="Size Scale of LOB Storage" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.lob_file_scale</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">32</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">unit used for storage of lobs in the .lobs file</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The default value
represents units of 32KB. When the average size of individual
lobs in the database is smaller, a smaller unit can be used to
reduce the overall size of the .lobs file. Values 1, 2, 4, 8,
16, 32 can be used.</p>
<pre class="programlisting">SET FILES LOB SCALE <numeric value></pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N158F9"></a>
<p class="title">
<b>Table 13.48. Compression of BLOB and CLOB data</b>
</p>
<div class="table-contents">
<table summary="Compression of BLOB and CLOB data" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.lob_compressed</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">use of compression for storage of blobs and clobs</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The default value is
false, indicating no compression. When the value is true at the
time of creation of a new database, blobs and clobs are stored
as compressed parts.</p>
<pre class="programlisting">SET FILES LOB COMPRESSED { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15926"></a>
<p class="title">
<b>Table 13.49. Internal Backup of Database Files</b>
</p>
<div class="table-contents">
<table summary="Internal Backup of Database Files" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.inc_backup</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">incremental backup of data file</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>During updates, the
contents of the .data file are modified. When this property is
true, the modified contents are backed up gradually. This causes
a marginal slowdown in operations, but allows fast checkpoint
and shutdown.</p>
<p>When the property is false, the .data
file is backed up entirely at the time of checkpoint and
shutdown. Up to version 1.8, HSQLDB supported only full
backup.</p>
<pre class="programlisting">SET FILES BACKUP INCREMENT { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15955"></a>
<p class="title">
<b>Table 13.50. Use of Lock File</b>
</p>
<div class="table-contents">
<table summary="Use of Lock File" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.lock_file</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">use of lock file - can also be used with an existing
<code class="literal">file:</code> database</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>By default, a lock file is
created for each file database that is opened for read and
write. This property can be specified with the value false to
prevent the lock file from being created. This usage is not
recommended but may be desirable when flash type storage is
used. This property applies to existing file: databases as well
as new databases.</p>
<pre class="programlisting">this property cannot be set with an SQL statement</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15985"></a>
<p class="title">
<b>Table 13.51. Logging Data Change Statements</b>
</p>
<div class="table-contents">
<table summary="Logging Data Change Statements" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.log_data</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">logging data change</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property can be set
to <code class="literal">false</code> when database recovery in the event
of an unexpected crash is not necessary. A database that is used
as a temporary cache is an example. Regardless of the value of
this property, if there is a proper shutdown of the database,
all the changed data is stored. A checkpoint or shutdown still
rewrites the <code class="literal">.script</code> file and saves the
<code class="literal">.backup</code> file according to the other
settings.</p>
<pre class="programlisting">SET FILES LOG { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N159BB"></a>
<p class="title">
<b>Table 13.52. Automatic Checkpoint Frequency</b>
</p>
<div class="table-contents">
<table summary="Automatic Checkpoint Frequency" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.log_size</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">50</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">size of log when checkpoint is performed</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The value is the size (in
megabytes) that the <code class="literal">.log</code> file can reach
before an automatic checkpoint occurs. A checkpoint rewrites the
<code class="literal">.script</code> file and clears the
<code class="literal">.log</code> file.</p>
<pre class="programlisting">SET FILES LOG SIZE <numeric value></pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N159F1"></a>
<p class="title">
<b>Table 13.53. Automatic Defrag at Checkpoint</b>
</p>
<div class="table-contents">
<table summary="Automatic Defrag at Checkpoint" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.defrag_limit</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">0</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">percentage of unused space causing a defrag at
checkpoint</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>When a checkpoint is
performed, the percentage of wasted space in the .data file is
calculated. If the wasted space is above the specified limit, a
defrag operation is performed. The default is 0, which means no
automatic checkpoint. The numeric value must be between 0 and
100 and is interpreted as a percentage of the current size of
the .data file.</p>
<pre class="programlisting">SET FILES DEFRAG <numeric value></pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15A1E"></a>
<p class="title">
<b>Table 13.54. Compression of the .script file</b>
</p>
<div class="table-contents">
<table summary="Compression of the .script file" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.script_format</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">0</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">compressed .script file</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>If the property is set
with the value 3, the .script file is stored in compressed
format. This is useful for large script files. The .script is no
longer readable when the
<code class="literal">hsqldb.script_format=3</code> has been
used.</p>
<pre class="programlisting">This property cannot be set with an SQL statement</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15A4E"></a>
<p class="title">
<b>Table 13.55. Logging Data Change Statements Frequency</b>
</p>
<div class="table-contents">
<table summary="Logging Data Change Statements Frequency" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.write_delay</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">write delay performing fsync of log file entries</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>If the property is true,
the default WRITE DELAY property of the database is used, which
is 500 milliseconds. If the property is false, the WRITE DELAY
is set to 0 seconds. The log is written to file regardless of
this property. The property controls the fsync that forces the
written log to be persisted to disk. The SQL command for this
property allows more precise control over the
property.</p>
<pre class="programlisting">SET FILES WRITE DELAY {{ TRUE | FALSE } | <seconds value> | <milliseconds value> MILLIS</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15A7B"></a>
<p class="title">
<b>Table 13.56. Logging Data Change Statements Frequency</b>
</p>
<div class="table-contents">
<table summary="Logging Data Change Statements Frequency" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.write_delay_millis</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">500</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">write delay for performing fsync of log file
entries</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>If the property is used,
the WRITE DELAY property of the database is set the given value
in milliseconds. The property controls the fsync that forces the
written log to be persisted to disk. The SQL command for this
property allows the same level of control over the
property.</p>
<pre class="programlisting">SET FILES WRITE DELAY {{ TRUE | FALSE } | <seconds value> | <milliseconds value> MILLIS</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15AA8"></a>
<p class="title">
<b>Table 13.57. Use of NIO for Disk Table Storage</b>
</p>
<div class="table-contents">
<table summary="Use of NIO for Disk Table Storage" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.nio_data_file</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">use of nio access methods for the .data file</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>Setting this property to
<code class="literal">false</code> will avoid the use of nio access
methods, resulting in somewhat reduced speed. If the data file
is larger than hsqldb.nio_max_size (default 256MB) when it is
first opened (or when its size is increased), nio access methods
are not used. Also, if the file gets larger than the amount of
available computer memory that needs to be allocated for nio
access, non-nio access methods are
used.</p>
<pre class="programlisting">SET FILES NIO { TRUE | FALSE }</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15AD8"></a>
<p class="title">
<b>Table 13.58. Use of NIO for Disk Table Storage</b>
</p>
<div class="table-contents">
<table summary="Use of NIO for Disk Table Storage" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.nio_max_size</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">256</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">nio buffer size limit</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The maximum size of .data
file in mega bytes that can use the nio access method. When the
file gets larger than this limit, non-nio access methods are
used. Values 64, 128, 256, 512, 1024, and larger multiples of
512 can be used. The default is
256MB.</p>
<pre class="programlisting">SET FILES NIO SIZE <numeric value></pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15B05"></a>
<p class="title">
<b>Table 13.59. Recovery Log Processing</b>
</p>
<div class="table-contents">
<table summary="Recovery Log Processing" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.full_log_replay</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">recovery log processing</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The .log file is processed
during recovery after a forced shutdwon. Out of memory
conditions always abort the startup. Any other exception stops
the processing of the .log file and by default, continues the
startup process. If this property is true, the startup process
is stopped if any exception occurs. Exceptions are usually
caused by incomplete lines of SQL statements near the end of the
.log file, which were not fully synced to disk when an abnormal
shutdown occurred.</p>
<pre class="programlisting">This property cannot be set with an SQL statement</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15B32"></a>
<p class="title">
<b>Table 13.60. Default Properties for TEXT Tables</b>
</p>
<div class="table-contents">
<table summary="Default Properties for TEXT Tables" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">textdb.*</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">0</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">default properties for new text tables</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>Properties that override
the database engine defaults for newly created text tables.
Settings in the text table <code class="literal">SET <tablename> SOURCE
<source string> </code>command override both the engine
defaults and the database properties defaults. Individual
<span class="property">textdb.*</span> properties are listed in the <a class="link" href="texttables-chapt.html" title="Chapter 5. Text Tables">Text Tables</a> chapter.</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15B66"></a>
<p class="title">
<b>Table 13.61. Forcing Garbage Collection</b>
</p>
<div class="table-contents">
<table summary="Forcing Garbage Collection" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">runtime.gc_interval</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">0</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">forced garbage collection</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This setting forces
garbage collection each time a set number of result set row or
cache row objects are created. The default, "0" means no garbage
collection is forced by the
program.</p>
<pre class="programlisting">SET DATABASE GC <numeric value></pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
</div>
<div class="section" title="Crypt Properties">
<div class="titlepage">
<div>
<div>
<h3 class="title">
<a name="dpc_crypt_props"></a>Crypt Properties</h3>
</div>
</div>
</div>
<div class="table">
<a name="N15B97"></a>
<p class="title">
<b>Table 13.62. Crypt Property For LOBs</b>
</p>
<div class="table-contents">
<table summary="Crypt Property For LOBs" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">crypt_lobs</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">encryption of lobs</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>If the property is true,
the contents of the .lobs file is encrypted as
well.</p>
<pre class="programlisting">this property cannot be set with an SQL statement</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15BC4"></a>
<p class="title">
<b>Table 13.63. Cipher Key for Encrypted Database</b>
</p>
<div class="table-contents">
<table summary="Cipher Key for Encrypted Database" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">crypt_key</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">none</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">encryption</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The cipher key for an
encrypted database.</p>
<pre class="programlisting">this property cannot be set with an SQL statement</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15BF1"></a>
<p class="title">
<b>Table 13.64. Crypt Provider Encrypted Database</b>
</p>
<div class="table-contents">
<table summary="Crypt Provider Encrypted Database" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">crypt_provider</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">none</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">encryption</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The fully-qualified class
name of the cryptography provider. This property is not used for
the default security provider.</p>
<pre class="programlisting">this property cannot be set with an SQL statement</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15C1E"></a>
<p class="title">
<b>Table 13.65. Cipher Specification for Encrypted Database</b>
</p>
<div class="table-contents">
<table summary="Cipher Specification for Encrypted Database" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">crypt_type</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">none</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">encryption</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>The cipher
specification.</p>
<pre class="programlisting">this property cannot be set with an SQL statement</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<p>When connecting to an <em class="glossterm">in-process</em> database
creates a new database, or opens an existing database (i.e. it is the
first connection made to the database by the application), all the
user-defined database properties listed in this section can be specified
as URL properties.</p>
<p>When HSQLDB is used with OpenOffice.org as an external
database, the property "default_schema=true" must be set on the URL,
otherwise the program will not operate correctly as it does with its
built-in hsqldb instance.</p>
</div>
</div>
<div class="section" title="System Properties">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both">
<a name="dpc_system_props"></a>System Properties</h2>
</div>
</div>
</div>
<p>A few system properties are used by HyperSQL. These are set on the
Java command line or by calling System.setProperty() from the user's
program. They are not valid as URL or connection properties.</p>
<div class="table">
<a name="N15C58"></a>
<p class="title">
<b>Table 13.66. Logging Framework</b>
</p>
<div class="table-contents">
<table summary="Logging Framework" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.reconfig_logging</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">true</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">configuring the framework logging</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>Setting this system property
false avoids reconfiguring the framework logging system such as
Log4J or java.util.Logging. If the property does not exist or is
true, reconfiguration takes place.</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15C82"></a>
<p class="title">
<b>Table 13.67. Text Tables</b>
</p>
<div class="table-contents">
<table summary="Text Tables" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">textdb.allow_full_path</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">false</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">text table file locations</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>Setting this system property
true allows text table sources and files to be opened on all
available paths. It also allows pure mem: databases to open such
files. By default, only the database directory and its
subdirectories are allowed. See the Text Tables
chapter.</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
<div class="table">
<a name="N15CAC"></a>
<p class="title">
<b>Table 13.68. Java Functions</b>
</p>
<div class="table-contents">
<table summary="Java Functions" cellspacing="0" width="100%" style="border-collapse: collapse;border-top: 0.5pt solid ; border-bottom: 0.5pt solid ; border-left: 0.5pt solid ; border-right: 0.5pt solid ; ">
<colgroup>
<col width="6.5cm" align="left" class="c1">
<col width="1.5cm" align="left" class="c2">
<col align="left" class="c3">
</colgroup>
<thead>
<tr>
<th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Name</th><th style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left">Default</th><th style="border-bottom: 0.5pt solid ; " align="left">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><span class="property">hsqldb.method_class_names</span></td><td style="border-right: 0.5pt solid ; border-bottom: 0.5pt solid ; " align="left" valign="top"><code class="literal">none</code></td><td style="border-bottom: 0.5pt solid ; " align="left" valign="top">allowed Java classes</td>
</tr>
<tr>
<td style="" colspan="3" align="left" valign="top">
<p>This property needs to be
set with the names (including wildcards) of Java classes that can
be used for routines based on Java static methods. See the SQL
Invoked Routines chapter.</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="table-break">
</div>
</div>
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