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>Streaming Replication Check</TITLE
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><H1
CLASS="SECT1"
><A
NAME="RUNTIME-STREAMING-REPLICATION-CHECK"
>5.11. Streaming Replication Check</A
></H1
><P
> <SPAN
CLASS="PRODUCTNAME"
>Pgpool-II</SPAN
> can work with <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> native
Streaming Replication, that is available since <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 9.0.
To configure <SPAN
CLASS="PRODUCTNAME"
>Pgpool-II</SPAN
> with streaming
replication, enable <A
HREF="runtime-config-runnung-mode.html#GUC-MASTER-SLAVE-MODE"
>master_slave_mode</A
> and set
<A
HREF="runtime-config-runnung-mode.html#GUC-MASTER-SLAVE-SUB-MODE"
>master_slave_sub_mode</A
> to <TT
CLASS="LITERAL"
>'stream'</TT
>.
</P
><P
> <SPAN
CLASS="PRODUCTNAME"
>Pgpool-II</SPAN
> assumes that Streaming Replication
is configured with Hot Standby on PostgreSQL, which means that the
standby database can handle read-only queries.
</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><A
NAME="GUC-SR-CHECK-PERIOD"
></A
><TT
CLASS="VARNAME"
>sr_check_period</TT
> (<TT
CLASS="TYPE"
>integer</TT
>)
</DT
><DD
><P
> Specifies the time interval in seconds to check the streaming
replication delay.
Default is 0, which means the check is disabled.
</P
><P
> This parameter can be changed by reloading the <SPAN
CLASS="PRODUCTNAME"
>Pgpool-II</SPAN
> configurations.
</P
></DD
><DT
><A
NAME="GUC-SR-CHECK-USER"
></A
><TT
CLASS="VARNAME"
>sr_check_user</TT
> (<TT
CLASS="TYPE"
>string</TT
>)
</DT
><DD
><P
> Specifies the <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> user name to perform streaming replication check.
The user must exist on all the <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> backends.
</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
> <TT
CLASS="VARNAME"
>sr_check_user</TT
>> and <A
HREF="runtime-streaming-replication-check.html#GUC-SR-CHECK-PASSWORD"
>sr_check_password</A
>
are used even when <A
HREF="runtime-streaming-replication-check.html#GUC-SR-CHECK-PERIOD"
>sr_check_period</A
> is set to 0 (disabled)
for the identification of the primary server.
</P
></BLOCKQUOTE
></DIV
><P
> This parameter can be changed by reloading the <SPAN
CLASS="PRODUCTNAME"
>Pgpool-II</SPAN
> configurations.
</P
></DD
><DT
><A
NAME="GUC-SR-CHECK-PASSWORD"
></A
><TT
CLASS="VARNAME"
>sr_check_password</TT
> (<TT
CLASS="TYPE"
>string</TT
>)
</DT
><DD
><P
> Specifies the password of the <A
HREF="runtime-streaming-replication-check.html#GUC-SR-CHECK-USER"
>sr_check_user</A
> <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> user
to perform the streaming replication checks.
Use <TT
CLASS="LITERAL"
>''</TT
> (empty string) if the user does not requires a password.
</P
><P
> This parameter can be changed by reloading the <SPAN
CLASS="PRODUCTNAME"
>Pgpool-II</SPAN
> configurations.
</P
></DD
><DT
><A
NAME="GUC-SR-CHECK-DATABASE"
></A
><TT
CLASS="VARNAME"
>sr_check_database</TT
> (<TT
CLASS="TYPE"
>string</TT
>)
</DT
><DD
><P
> Specifies the database to perform streaming replication delay checks.
The default is <TT
CLASS="LITERAL"
>"postgres"</TT
>.
</P
><P
> This parameter can be changed by reloading the <SPAN
CLASS="PRODUCTNAME"
>Pgpool-II</SPAN
> configurations.
</P
></DD
><DT
><A
NAME="GUC-DELAY-THRESHOLD"
></A
><TT
CLASS="VARNAME"
>delay_threshold</TT
> (<TT
CLASS="TYPE"
>integer</TT
>)
</DT
><DD
><P
> Specifies the maximum tolerance level of replication delay in
<ACRONYM
CLASS="ACRONYM"
>WAL</ACRONYM
> bytes on the standby server against the
primary server. If the delay exceeds this configured level,
<SPAN
CLASS="PRODUCTNAME"
>Pgpool-II</SPAN
> stops sending the <ACRONYM
CLASS="ACRONYM"
> SELECT</ACRONYM
> queries to the standby server and starts routing
everything to the primary server even if <A
HREF="runtime-config-load-balancing.html#GUC-LOAD-BALANCE-MODE"
>load_balance_mode</A
>
is enabled, until the standby catches-up with the primary.
Setting this parameter to 0 disables the delay checking.
This delay threshold check is performed every <A
HREF="runtime-streaming-replication-check.html#GUC-SR-CHECK-PERIOD"
>sr_check_period</A
>.
Default is 0.
</P
><P
> This parameter can be changed by reloading the <SPAN
CLASS="PRODUCTNAME"
>Pgpool-II conf</SPAN
>igurations.
</P
></DD
><DT
><A
NAME="GUC-LOG-STANDBY-DELAY"
></A
><TT
CLASS="VARNAME"
>log_standby_delay</TT
> (<TT
CLASS="TYPE"
>string</TT
>)
</DT
><DD
><P
> Specifies when to log the replication delay. Below table contains the list
of all valid values for the parameter.
</P
><DIV
CLASS="TABLE"
><A
NAME="LOG-STANDBY-DELAY-TABLE"
></A
><P
><B
>Table 5-9. Log standby delay options</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>Value</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="LITERAL"
>'none'</TT
></TD
><TD
>Never log the standby delay</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>'always'</TT
></TD
><TD
>Log the standby delay, every time the replication delay is checked</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>'if_over_threshold'</TT
></TD
><TD
>Only log the standby delay, when it exceeds <A
HREF="runtime-streaming-replication-check.html#GUC-DELAY-THRESHOLD"
>delay_threshold</A
> value</TD
></TR
></TBODY
></TABLE
></DIV
><P
> This parameter can be changed by reloading the <SPAN
CLASS="PRODUCTNAME"
>Pgpool-II</SPAN
> configurations.
</P
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