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UPdate vacuum man page to be clearer.

This commit is contained in:
Bruce Momjian 2000-04-14 17:37:54 +00:00
parent 9edb0f7ec2
commit 91cce19de8
1 changed files with 10 additions and 10 deletions
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20
doc/src/sgml/ref/vacuum.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.8 2000/04/05 21:51:11 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.9 2000/04/14 17:37:54 momjian Exp $
Postgres documentation
-->
@ -179,15 +179,15 @@ NOTICE: Index <replaceable class="PARAMETER">index</replaceable>: Pages 28;
The open database is the target for <command>VACUUM</command>.
</para>
<para>
We recommend that active production databases be cleaned nightly, in order
to keep statistics relatively current. The <command>VACUUM</command>
query may be executed at any time, however. In particular, after
copying a large class into <productname>Postgres</productname>
or after deleting a large number of
records, it may be a good idea to issue a <command>VACUUM ANALYZE</command>
query. This will update the system catalogs with the results of all
recent changes, and allow the <productname>Postgres</productname>
query optimizer to make better choices in planning user queries.
We recommend that active production databases be
<command>VACUUMM</command>-ed nightly, in order to keep remove
expired rows. After copying a large class into
<productname>Postgres</productname> or after deleting a large number
of records, it may be a good idea to issue a <command>VACUUM
ANALYZE</command> query. This will update the system catalogs with
the results of all recent changes, and allow the
<productname>Postgres</productname> query optimizer to make better
choices in planning user queries.
</para>
</refsect2>