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| author | Bruce Momjian <bruce@momjian.us> | 2001-10-11 21:16:26 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2001-10-11 21:16:26 +0000 |
| commit | e98476eb032bd4dc32ca97212b660cad0bbadef4 (patch) | |
| tree | 41186b24db2f010ee523dc33183d81bf90c7f692 /doc/src | |
| parent | 9e642cd7ef17b6f8dce3a38f38382272b84d6cc3 (diff) | |
| download | postgresql-e98476eb032bd4dc32ca97212b660cad0bbadef4.tar.gz postgresql-e98476eb032bd4dc32ca97212b660cad0bbadef4.zip | |
Document use of GEQO param in subquery pullups.
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/runtime.sgml | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml index b3d68e40068..0bb3eb1c44b 100644 --- a/doc/src/sgml/runtime.sgml +++ b/doc/src/sgml/runtime.sgml @@ -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"> @@ -719,7 +719,9 @@ env PGOPTIONS='-c geqo=off' psql this many FROM items involved. (Note that a JOIN construct counts as only one FROM item.) The default is 11. For simpler 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> </listitem> </varlistentry> |