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Marginal improvements in the wording of the autovacuum documentation: 

be consistent about whether it's called a daemon or a subprocess, and
don't describe the autovacuum setting in exactly the same way as the
stats_start_collector setting, because that leaves people thinking (if
they aren't paying close attention) that autovacuum can't be changed
on the fly.
This commit is contained in:
Tom Lane 2006-01-21 19:34:42 +00:00
parent 27959dd746
commit b42f307340
1 changed files with 17 additions and 14 deletions
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29
doc/src/sgml/config.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.43 2006/01/11 23:14:29 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.44 2006/01/21 19:34:42 tgl Exp $
-->
<chapter Id="runtime-config">
<title>Server Configuration</title>
@ -867,9 +867,9 @@ SET ENABLE_SEQSCAN TO OFF;
Sets the maximum number of disk pages for which free space will
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
16 * <varname>max_fsm_relations</varname>. The default is 20000,
but <application>initdb</> will try to set it as close as possible
to 200000, depending on the amount of available memory.
16 * <varname>max_fsm_relations</varname>. The default is chosen
by <application>initdb</> depending on the amount of available memory,
and can range from 20000 to 200000.
This option can only be set at server start.
</para>
</listitem>
@ -2825,8 +2825,11 @@ SELECT * FROM parent WHERE key = 2400;
Controls whether the server should start the
statistics-collection subprocess. This is on by default, but
may be turned off if you know you have no interest in
collecting statistics. This option can only be set at server
start.
collecting statistics or running autovacuum.
This option can only be set at server start, because the collection
subprocess cannot be started or stopped on-the-fly. (However, the
extent to which statistics are actually gathered can be changed while
the server is running, so long as the subprocess exists.)
</para>
</listitem>
</varlistentry>
@ -2909,12 +2912,12 @@ SELECT * FROM parent WHERE key = 2400;
<indexterm>
<primary>autovacuum</primary>
<secondary>global configuration parameters</secondary>
<secondary>configuration parameters</secondary>
</indexterm>
<para>
These settings control the default behavior for the <firstterm>autovacuum
daemon</firstterm>. Please refer to <xref linkend="autovacuum"> for
These settings control the behavior of the <firstterm>autovacuum</>
feature. Please refer to <xref linkend="autovacuum"> for
more information.
</para>
@ -2927,10 +2930,10 @@ SELECT * FROM parent WHERE key = 2400;
</indexterm>
<listitem>
<para>
Controls whether the server should start the
autovacuum subprocess. This is off by default.
Controls whether the server should run the
autovacuum daemon. This is off by default.
<varname>stats_start_collector</> and <varname>stats_row_level</>
must also be on for this to start.
must also be turned on for autovacuum to work.
This option can only be set at server start or in the
<filename>postgresql.conf</filename> file.
</para>
@ -2945,7 +2948,7 @@ SELECT * FROM parent WHERE key = 2400;
<listitem>
<para>
Specifies the delay between activity rounds for the autovacuum
subprocess. In each round the subprocess examines one database
daemon. In each round the daemon examines one database
and issues <command>VACUUM</> and <command>ANALYZE</> commands
as needed for tables in that database. The delay is measured
in seconds, and the default is 60.