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Update EXPLAIN wording for GEQO usage.

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This commit is contained in:
Bruce Momjian 2006-01-20 16:41:55 +00:00
parent 413d492d32
commit 138fdf32bb
1 changed files with 7 additions and 5 deletions
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12
doc/src/sgml/ref/explain.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/explain.sgml,v 1.35 2005/01/04 00:39:53 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/explain.sgml,v 1.36 2006/01/20 16:41:55 momjian Exp $
PostgreSQL documentation
-->
@ -151,11 +151,13 @@ ROLLBACK;
</para>
<para>
Prior to <productname>PostgreSQL</productname> 7.3, the plan was
emitted in the form of a <literal>NOTICE</literal> message. Now it
appears as a query result (formatted like a table with a single
text column).
Genetic query optimization (<acronym>GEQO</acronym>) randomly
tests execution plans. Therefore, when the number of tables exceeds
<varname>geqo_threshold</> causing genetic query optimization to be
used, the execution plan is likely to change each time the statement
is executed.
</para>
</refsect1>
<refsect1>