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Add documentation stating how to determine if FSM settings are too low

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--- look at a database-wide VACUUM VERBOSE.
This commit is contained in:
Bruce Momjian 2005-04-23 03:27:40 +00:00
parent e092828241
commit 25434e32cb
1 changed files with 9 additions and 1 deletions
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10
doc/src/sgml/runtime.sgml
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@ -1,5 +1,5 @@
<!-- <!--
$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.314 2005/04/21 19:18:12 tgl Exp $ $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.315 2005/04/23 03:27:40 momjian Exp $
--> -->
<chapter Id="runtime"> <chapter Id="runtime">
@ -1151,6 +1151,10 @@ SET ENABLE_SEQSCAN TO OFF;
be tracked in the shared free-space map. Six bytes of shared memory be tracked in the shared free-space map. Six bytes of shared memory
are consumed for each page slot. This setting must be more than are consumed for each page slot. This setting must be more than
16 * <varname>max_fsm_relations</varname>. The default is 20000. 16 * <varname>max_fsm_relations</varname>. The default is 20000.
The last few lines of a database-wide <command>VACUUM VERBOSE</>
can help in determining if the the default setting is suitable.
A <literal>NOTICE</> message is also printed during such an operation
if the current setting is too low.
This option can only be set at server start. This option can only be set at server start.
</para> </para>
</listitem> </listitem>
@ -1167,6 +1171,10 @@ SET ENABLE_SEQSCAN TO OFF;
free space will be tracked in the shared free-space map. Roughly free space will be tracked in the shared free-space map. Roughly
fifty bytes of shared memory are consumed for each slot. fifty bytes of shared memory are consumed for each slot.
The default is 1000. The default is 1000.
The last few lines of a database-wide <command>VACUUM VERBOSE</>
can help in determining if the the default setting is suitable.
A <literal>NOTICE</> message is also printed during such an operation
if the current setting is too low.
This option can only be set at server start. This option can only be set at server start.
</para> </para>
</listitem> </listitem>