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Add note that autovacuum can use up several times maintenance_work_mem, 

with warning against setting it too high.
This commit is contained in:
Magnus Hagander 2008-12-08 15:11:39 +00:00
parent 173a676027
commit bd33aca36e
1 changed files with 6 additions and 1 deletions
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7
doc/src/sgml/config.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.198 2008/11/21 20:21:59 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.199 2008/12/08 15:11:39 mha Exp $ -->
<chapter Id="runtime-config">
<title>Server Configuration</title>
@ -881,6 +881,11 @@ SET ENABLE_SEQSCAN TO OFF;
than <varname>work_mem</varname>. Larger settings might improve
performance for vacuuming and for restoring database dumps.
</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>
</varlistentry>