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New autovacuum_work_mem parameter

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If autovacuum_work_mem is set, autovacuum workers now use
this parameter in preference to maintenance_work_mem.

Peter Geoghegan
This commit is contained in:
Simon Riggs
2013-12-12 11:42:39 +00:00
parent 36da3cfb45
commit 8693559cac
6 changed files with 69 additions and 10 deletions
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22
doc/src/sgml/config.sgml
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@ -1198,8 +1198,26 @@ include 'filename'
</para>
<para>
Note that when autovacuum runs, up to
<xref linkend="guc-autovacuum-max-workers"> times this memory may be
allocated, so be careful not to set the default value too high.
<xref linkend="guc-autovacuum-max-workers"> times this memory
may be allocated, so be careful not to set the default value
too high. It may be useful to control for this by separately
setting <xref linkend="guc-autovacuum-work-mem">.
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-autovacuum-work-mem" xreflabel="autovacuum_work_mem">
<term><varname>autovacuum_work_mem</varname> (<type>integer</type>)</term>
<indexterm>
<primary><varname>autovacuum_work_mem</> configuration parameter</primary>
</indexterm>
<listitem>
<para>
Specifies the maximum amount of memory to be used by each
autovacuum worker process. It defaults to -1, indicating that
the value of <xref linkend="guc-maintenance-work-mem"> should
be used instead. The setting has no effect on the behavior of
<command>VACUUM</command> when run in other contexts.
</para>
</listitem>
</varlistentry>