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Document use of GEQO param in subquery pullups.

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This commit is contained in:
Bruce Momjian 2001-10-11 21:16:26 +00:00
parent 9e642cd7ef
commit e98476eb03
1 changed files with 4 additions and 2 deletions
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doc/src/sgml/runtime.sgml
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@ -1,5 +1,5 @@
<!-- <!--
$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.89 2001/10/09 18:46:00 petere Exp $ $Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.90 2001/10/11 21:16:26 momjian Exp $
--> -->
<Chapter Id="runtime"> <Chapter Id="runtime">
@ -719,7 +719,9 @@ env PGOPTIONS='-c geqo=off' psql
this many FROM items involved. (Note that a JOIN construct this many FROM items involved. (Note that a JOIN construct
counts as only one FROM item.) The default is 11. For simpler counts as only one FROM item.) The default is 11. For simpler
queries it is usually best to use the queries it is usually best to use the
deterministic, exhaustive planner. deterministic, exhaustive planner. This parameter also controls
how hard the optimizer will try to merge subquery
<literal>FROM</literal> clauses into the upper query.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>