diff options
Diffstat (limited to 'doc/src/sgml/ref/explain.sgml')
| -rw-r--r-- | doc/src/sgml/ref/explain.sgml | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/doc/src/sgml/ref/explain.sgml b/doc/src/sgml/ref/explain.sgml index 748e7e16ae2..a9da7a19f51 100644 --- a/doc/src/sgml/ref/explain.sgml +++ b/doc/src/sgml/ref/explain.sgml @@ -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> |