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Increase the default value of default_statistics_target from 10 to 100,

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and its maximum value from 1000 to 10000.  ALTER TABLE SET STATISTICS
similarly now allows a value up to 10000.  Per discussion.
This commit is contained in:
Tom Lane
2008-12-13 19:13:44 +00:00
parent b69bde7749
commit 65e3ea7641
9 changed files with 27 additions and 27 deletions
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4
doc/src/sgml/perform.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/perform.sgml,v 1.68 2007/12/28 21:03:31 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/perform.sgml,v 1.69 2008/12/13 19:13:43 tgl Exp $ -->
<chapter id="performance-tips">
<title>Performance Tips</title>
@@ -562,7 +562,7 @@ SELECT attname, n_distinct, most_common_vals FROM pg_stats WHERE tablename = 'ro
column-by-column basis using the <command>ALTER TABLE SET STATISTICS</>
command, or globally by setting the
<xref linkend="guc-default-statistics-target"> configuration variable.
The default limit is presently 10 entries. Raising the limit
The default limit is presently 100 entries. Raising the limit
might allow more accurate planner estimates to be made, particularly for
columns with irregular data distributions, at the price of consuming
more space in <structname>pg_statistic</structname> and slightly more