diff options
| -rw-r--r-- | doc/src/sgml/runtime.sgml | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml index 4322a1f42e1..e26662117e1 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 1.50 2001/02/10 00:50:18 petere Exp $ +$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.51 2001/02/15 04:28:50 tgl Exp $ --> <Chapter Id="runtime"> @@ -639,7 +639,7 @@ env PGOPTIONS='-c geqo=off' psql algorithm: The pool size is the number of individuals in one population. Valid values are between 128 and 1024. If it is set to 0 (the default) a pool size of 2^(QS+1), where QS - is the number of relations in the query, is taken. The effort + is the number of FROM items in the query, is taken. The effort is used to calculate a default for generations. Valid values are between 1 and 80, 40 being the default. Generations specifies the number of iterations in the algorithm. The @@ -659,9 +659,10 @@ env PGOPTIONS='-c geqo=off' psql <term>GEQO_THRESHOLD (<type>integer</type>)</term> <listitem> <para> - Only use genetic query optimization for queries with at least - this many relations involved. The default is 11. For less - relations it is probably more efficient to use the + Use genetic query optimization to plan queries with at least + 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. </para> </listitem> |