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Patch to mention cost-based delay in vacuum reference

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Alvaro Herrera
This commit is contained in:
Bruce Momjian 2005-07-30 15:45:49 +00:00
parent 1f54d43075
commit 2ab9997ec2
1 changed files with 11 additions and 1 deletions
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12
doc/src/sgml/ref/vacuum.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.36 2004/12/02 19:28:48 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.37 2005/07/30 15:45:49 momjian Exp $
PostgreSQL documentation
-->
@ -174,6 +174,15 @@ VACUUM [ FULL | FREEZE ] [ VERBOSE ] ANALYZE [ <replaceable class="PARAMETER">ta
to occupy less disk space. <command>VACUUM FULL</command> will usually
shrink the table more than a plain <command>VACUUM</command> would.
</para>
<para>
During <command>VACUUM</command> execution, there can be a substantial
increase in I/O traffic, which cause poor performance for other active
sessions. Therefore, it is sometimes advisable to use
the cost-based vacuum delay feature. See <xref
linkend="runtime" endterm="runtime-config-resource-vacuum-cost"> for more
details.
</para>
</refsect1>
<refsect1>
@ -229,6 +238,7 @@ VACUUM
<simplelist type="inline">
<member><xref linkend="app-vacuumdb" endterm="app-vacuumdb-title"></member>
<member><xref linkend="runtime" endterm="runtime-config-resource-vacuum-cost"></member>
</simplelist>
</refsect1>
</refentry>