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Avoid excessive Hot Standby feedback messages.

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Without this patch, when wal_receiver_status_interval=0, indicating that no
status messages should be sent, Hot Standby feedback messages are instead sent
extremely frequently.

Fujii Masao, with documentation changes by me.
This commit is contained in:
Robert Haas
2011-03-01 11:32:23 -05:00
parent c0b0076036
commit 59d6a75942
2 changed files with 5 additions and 4 deletions
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7
doc/src/sgml/config.sgml
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@ -2137,9 +2137,10 @@ SET ENABLE_SEQSCAN TO OFF;
<para>
Specifies whether or not a hot standby will send feedback to the primary
about queries currently executing on the standby. This parameter can
be used to eliminate query cancels caused by cleanup records, though
it can cause database bloat on the primary for some workloads.
The default value is <literal>off</literal>.
be used to eliminate query cancels caused by cleanup records, but
can cause database bloat on the primary for some workloads.
The default value is <literal>off</literal>. Feedback messages will not
be sent more frequently than once per <varname>wal_receiver_status_interval</>.
</para>
</listitem>
</varlistentry>