On Fri, Aug 06, 2004 at 07:28:38PM -0500, sandra ruiz wrote: > in the docummentation about the planer it says: > > "It first combines all possible ways of scanning and joining the relations > that appear in a query" > > I would like to know if there's a time limit to do that or if it just scans > ALL the posibilities until it finishes..no matter the time it takes..
Depends; if you join a lot of tables, it stops doing an exhaustive search and goes for genetic optimization instead: http://www.postgresql.org/docs/7.4/static/geqo.html /* Steinar */ -- Homepage: http://www.sesse.net/ ---------------------------(end of broadcast)--------------------------- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
