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Add note that autovacuum can use up several times maintenance_work_mem,

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with warning against setting it too high.
This commit is contained in:
Magnus Hagander 2008-12-08 15:11:42 +00:00
parent e78f83809b
commit 4e00382b9a
1 changed files with 6 additions and 1 deletions
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doc/src/sgml/config.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.164.2.5 2008/07/18 17:33:40 momjian Exp $ --> <!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.164.2.6 2008/12/08 15:11:42 mha Exp $ -->
<chapter Id="runtime-config"> <chapter Id="runtime-config">
<title>Server Configuration</title> <title>Server Configuration</title>
@ -860,6 +860,11 @@ SET ENABLE_SEQSCAN TO OFF;
than <varname>work_mem</varname>. Larger settings might improve than <varname>work_mem</varname>. Larger settings might improve
performance for vacuuming and for restoring database dumps. performance for vacuuming and for restoring database dumps.
</para> </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.
</para>
</listitem> </listitem>
</varlistentry> </varlistentry>