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Document that autovacuum cannot vacuum or analyze temporary tables.

This commit is contained in:
Bruce Momjian 2010-04-16 02:22:33 +00:00
parent b6c586a36c
commit b4fd1e246e
2 changed files with 17 additions and 2 deletions
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8
doc/src/sgml/maintenance.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/maintenance.sgml,v 1.102 2010/04/03 07:22:55 petere Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/maintenance.sgml,v 1.103 2010/04/16 02:22:33 momjian Exp $ -->
<chapter id="maintenance">
<title>Routine Database Maintenance Tasks</title>
@ -642,6 +642,12 @@ analyze threshold = analyze base threshold + analyze scale factor * number of tu
since the last <command>ANALYZE</command>.
</para>
<para>
Temporary tables cannot be accessed by autovacuum. Therefore,
appropriate vacuum and analyze operations should be performed via
session SQL commands.
</para>
<para>
The default thresholds and scale factors are taken from
<filename>postgresql.conf</filename>, but it is possible to override them

11
doc/src/sgml/ref/create_table.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/create_table.sgml,v 1.125 2010/04/03 07:23:00 petere Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/create_table.sgml,v 1.126 2010/04/16 02:22:33 momjian Exp $
PostgreSQL documentation
-->
@ -144,6 +144,15 @@ CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE <replaceable class="PAR
table are automatically temporary as well.
</para>
<para>
The <link linkend="autovacuum">autovacuum daemon</link> cannot
access and therefore cannot vacuum or analyze temporary tables.
For this reason, appropriate vacuum and analyze operations should be
performed via session SQL commands. For example, if a temporary
table is going to be used in complex queries, it is wise to run
<command>ANALYZE</> on the temporary table after it is populated.
</para>
<para>
Optionally, <literal>GLOBAL</literal> or <literal>LOCAL</literal>
can be written before <literal>TEMPORARY</> or <literal>TEMP</>.