Mark Lewis <mark.lewis@xxxxxxxx> writes: > Unfortunately there has been a planner regression in 8.2 in some cases > with these forms of queries. This was discussed a few weeks (months?) > ago on this forum. I haven't looked closely enough to confirm that this > is the problem in your case, but it seems likely. Yeah, the EXPLAIN ANALYZE output clearly shows a drastic underestimate of the number of rows out of a join like this, and a consequent choice of a nestloop above it that performs terribly. > We've been holding back from upgrading to 8.2 because this one is a > show-stopper for us. Well, you could always make your own version with this patch reverted: http://archives.postgresql.org/pgsql-committers/2006-11/msg00066.php I might end up doing that in the 8.2 branch if a better solution seems too large to back-patch. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 4: Have you searched our list archives? http://archives.postgresql.org
