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<title>Overview (Mondrian OLAP Engine, version 3.4.1)</title>
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<div class="block">Mondrian is an OLAP server implemented in Java.</div>
</div>
<p>See: <a href="#overview_description">Description</a></p>
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<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Packages table, listing packages, and an explanation">
<caption><span>Packages</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Package</th>
<th class="colLast" scope="col">Description</th>
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<tbody>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/calc/package-summary.html">mondrian.calc</a></td>
<td class="colLast">
<div class="block">Provides compiled expressions.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/calc/impl/package-summary.html">mondrian.calc.impl</a></td>
<td class="colLast">
<div class="block">Provides implementation classes for compiled expressions.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/gui/package-summary.html">mondrian.gui</a></td>
<td class="colLast">
<div class="block">Contains a workbench written in Swing for designing Mondrian schemas.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/gui/validate/package-summary.html">mondrian.gui.validate</a></td>
<td class="colLast"> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/gui/validate/impl/package-summary.html">mondrian.gui.validate.impl</a></td>
<td class="colLast"> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/i18n/package-summary.html">mondrian.i18n</a></td>
<td class="colLast">
<div class="block">Utilities for internationalization and localization.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/mdx/package-summary.html">mondrian.mdx</a></td>
<td class="colLast">
<div class="block">Defines a parse tree for MDX expressions.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/olap/package-summary.html">mondrian.olap</a></td>
<td class="colLast">
<div class="block">Mondrian's core package, this defines connections and the catalog metamodel,
and allows you to execute queries.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/olap/fun/package-summary.html">mondrian.olap.fun</a></td>
<td class="colLast">
<div class="block">Defines the set of MDX built-in functions.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/olap/fun/extra/package-summary.html">mondrian.olap.fun.extra</a></td>
<td class="colLast">
<div class="block">Defines MDX extension functions.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/olap/fun/vba/package-summary.html">mondrian.olap.fun.vba</a></td>
<td class="colLast">
<div class="block">Implements the set of functions defined by the Visual Basic for Applications
(VBA) specification.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/olap/type/package-summary.html">mondrian.olap.type</a></td>
<td class="colLast">
<div class="block">Type system for MDX expessions.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/olap4j/package-summary.html">mondrian.olap4j</a></td>
<td class="colLast">
<div class="block">olap4j driver for the Mondrian OLAP engine.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/parser/package-summary.html">mondrian.parser</a></td>
<td class="colLast"> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/recorder/package-summary.html">mondrian.recorder</a></td>
<td class="colLast">
<div class="block">Provides a set a classes for logging the process of a task.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/resource/package-summary.html">mondrian.resource</a></td>
<td class="colLast"> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/rolap/package-summary.html">mondrian.rolap</a></td>
<td class="colLast">
<div class="block">Implements the data access layer for the olap package.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/rolap/agg/package-summary.html">mondrian.rolap.agg</a></td>
<td class="colLast">
<div class="block">Manages a cache of aggregates containing cell values.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/rolap/aggmatcher/package-summary.html">mondrian.rolap.aggmatcher</a></td>
<td class="colLast">
<div class="block">Defines a 'matcher' which scans the schema to find candidate aggregate tables.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/rolap/cache/package-summary.html">mondrian.rolap.cache</a></td>
<td class="colLast">
<div class="block">Provides primitives for policy-based caching.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/rolap/sql/package-summary.html">mondrian.rolap.sql</a></td>
<td class="colLast">
<div class="block">Database-independent library for generating SQL.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/server/package-summary.html">mondrian.server</a></td>
<td class="colLast">
<div class="block">Augments the Mondrian engine with server functionality.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/server/monitor/package-summary.html">mondrian.server.monitor</a></td>
<td class="colLast"> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/spi/package-summary.html">mondrian.spi</a></td>
<td class="colLast">
<div class="block">Contains the server-provider interfaces (SPIs) which user-defined
extensions to Mondrian should implement.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/spi/impl/package-summary.html">mondrian.spi.impl</a></td>
<td class="colLast">
<div class="block">Provides implementations of SPIs defined in the <a href="mondrian/spi/package-summary.html"><code>mondrian.spi</code></a> package.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/test/package-summary.html">mondrian.test</a></td>
<td class="colLast">
<div class="block">Suite of regression tests.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/test/build/package-summary.html">mondrian.test.build</a></td>
<td class="colLast">
<div class="block">Regression tests relating to the build process.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/test/clearview/package-summary.html">mondrian.test.clearview</a></td>
<td class="colLast"> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/test/comp/package-summary.html">mondrian.test.comp</a></td>
<td class="colLast">
<div class="block">Utilities for comparison-based testing.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/test/loader/package-summary.html">mondrian.test.loader</a></td>
<td class="colLast">
<div class="block">Utilities to load test data.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/tui/package-summary.html">mondrian.tui</a></td>
<td class="colLast">
<div class="block">Text user interface for Mondrian.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/udf/package-summary.html">mondrian.udf</a></td>
<td class="colLast"> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/util/package-summary.html">mondrian.util</a></td>
<td class="colLast">
<div class="block">Mondrian utilities.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/web/servlet/package-summary.html">mondrian.web.servlet</a></td>
<td class="colLast"> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/web/taglib/package-summary.html">mondrian.web.taglib</a></td>
<td class="colLast">
<div class="block">Provides a tag library for embedding MDX queries in JSP pages.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/xmla/package-summary.html">mondrian.xmla</a></td>
<td class="colLast">
<div class="block">Implements the <a href="http://www.xmla.org/">XML for Analysis</a> API.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="mondrian/xmla/impl/package-summary.html">mondrian.xmla.impl</a></td>
<td class="colLast"> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="mondrian/xmla/test/package-summary.html">mondrian.xmla.test</a></td>
<td class="colLast"> </td>
</tr>
</tbody>
</table>
</div>
<div class="footer"><a name="overview_description">
<!-- -->
</a>
<div class="subTitle">
<div class="block">Mondrian is an OLAP server implemented in Java.
<h2>Introduction</h2>
<p>See <a href="../architecture.html">architecture</a>.</p>
<h2>Components</h2>
<h3>Query transformer</h3>
<p>See <a href="mondrian/olap/Parser.html" title="class in mondrian.olap"><code>Parser</code></a>.</p>
<h3>Metadata</h3>
<p>It is represented as an XML file. The metadata is loaded into memory the
first time you reference a dimensional model. You can modify the model at
runtime by creating instances of classes such as <code><a href="mondrian/rolap/RolapHierarchy.html" title="class in mondrian.rolap"><code>RolapHierarchy</code></a></code>.</p>
<h3>Calculation layer</h3>
<p><i>todo</i>: See <a href="mondrian/olap/Query.html" title="class in mondrian.olap"><code>Query</code></a> and <a href="mondrian/olap/Result.html" title="interface in mondrian.olap"><code>Result</code></a>.</p>
<p><i>todo</i>: The <code>package <a href="mondrian/rolap/package-summary.html"><code>mondrian.rolap</code></a></code>. is the one and
only implementation of the API. The DriverManager (<code>class <a href="mondrian/olap/DriverManager.html" title="class in mondrian.olap"><code>DriverManager</code></a></code>) acts as class-factory.</p>
<p><i>todo</i>: How members are calculated...</p>
<p><i>todo</i>: How aggregations are batched...</p>
<p><i>todo</i>: MDX functions. See <a href="#User_defined_functions">user-defined functions</a>.</p>
<h3>Aggregation manager</h3>
<p>Aggregations are based upon the relational model: as far as the aggregation
manager is concerned, there is no relationship between the columns <code>city</code>
and <code>state</code>. This means that all roll-ups are the same: you just drop
a column. Consider the 3 roll-ups possible by dropping a column from the
aggregation {<code>gender</code>, <code>city</code>, <code>state</code>}:
dropping <code>gender</code> is equivalent to removing the <code>[Gender]</code>
dimension; dropping <code>city</code> is equivalent to rolling up to a higher
level in the <code>[Geography]</code> hierarchy; and dropping <code>state</code>
is not even allowed in the dimensional model (no, sorry, you can't ask about
products sold in a cities called 'Portland'). This approach will also allow us
to implement 'drill anywhere'.</p>
<p>An aggregation is defined by a search condition, for example, <code>{state in
('CA', 'OR', 'WA'), city = <i>any</i>, gender = 'M', measure = 'Unit sales'}</code>.
The <i><code>any</code></i> value is important; if we had asked for a specific
set of cities, we would not later be able to roll-up by dropping the <code>city</code>
column.</p>
<p>The caching strategy is to throw out the aggregation with the lowest
cost/benefit ratio. The 'benefit' of an item is the effort it took to produce
(effort which it is saving future queries) multiplied by its 'usefulness' which
declines exponentially if it is not used over time. The 'cost' of an item is its
size.</p>
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