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Set a default autovacuum vacuum_cost_delay value of 20ms, to avoid excessive

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I/O utilization, per discussion.

While at it, lower the autovacuum vacuum and analyze threshold values to 50
tuples.  It is a bit higher (i.e. more conservative) than what I originally
proposed but much better than the old values for small tables.
This commit is contained in:
Alvaro Herrera
2007-07-24 01:53:56 +00:00
parent ab7d2b6a73
commit 53d2951be7
3 changed files with 12 additions and 11 deletions
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9
doc/src/sgml/config.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.131 2007/07/18 12:00:47 mha Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.132 2007/07/24 01:53:55 alvherre Exp $ -->
<chapter Id="runtime-config">
<title>Server Configuration</title>
@@ -3247,7 +3247,7 @@ SELECT * FROM parent WHERE key = 2400;
<para>
Specifies the minimum number of updated or deleted tuples needed
to trigger a <command>VACUUM</> in any one table.
The default is 500 tuples.
The default is 50 tuples.
This parameter can only be set in the <filename>postgresql.conf</>
file or on the server command line.
This setting can be overridden for individual tables by entries in
@@ -3265,7 +3265,7 @@ SELECT * FROM parent WHERE key = 2400;
<para>
Specifies the minimum number of inserted, updated or deleted tuples
needed to trigger an <command>ANALYZE</> in any one table.
The default is 250 tuples.
The default is 50 tuples.
This parameter can only be set in the <filename>postgresql.conf</>
file or on the server command line.
This setting can be overridden for individual tables by entries in
@@ -3343,8 +3343,9 @@ SELECT * FROM parent WHERE key = 2400;
<para>
Specifies the cost delay value that will be used in automatic
<command>VACUUM</> operations. If <literal>-1</> is
specified (which is the default), the regular
specified, the regular
<xref linkend="guc-vacuum-cost-delay"> value will be used.
The default value is 20 milliseconds.
This parameter can only be set in the <filename>postgresql.conf</>
file or on the server command line.
This setting can be overridden for individual tables by entries in