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Doc: mention that VACUUM can't utilize over 1GB of RAM

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Document that setting maintenance_work_mem to values over 1GB has no
effect on VACUUM.

Reported-by: Martín Marqués
Author: Laurenz Albe
Discussion: https://postgr.es/m/CABeG9LsZ2ozUMcqtqWu_-GiFKB17ih3p8wBHXcpfnHqhCnsc7A%40mail.gmail.com
Backpatch-through: 9.6, oldest supported release
This commit is contained in:
David Rowley 2021-07-04 22:28:38 +12:00
parent 63b1af9437
commit ec34040af1
1 changed files with 6 additions and 0 deletions
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6
doc/src/sgml/config.sgml
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@ -1893,6 +1893,12 @@ include_dir 'conf.d'
too high. It may be useful to control for this by separately too high. It may be useful to control for this by separately
setting <xref linkend="guc-autovacuum-work-mem"/>. setting <xref linkend="guc-autovacuum-work-mem"/>.
</para> </para>
<para>
Additionally, <command>VACUUM</command> is only able to utilize up to
a maximum of <literal>1GB</literal> of memory, so
<varname>maintenance_work_mem</varname> values higher than this have
no effect on <command>VACUUM</command>.
</para>
</listitem> </listitem>
</varlistentry> </varlistentry>