Pavel Stehule <pavel.steh...@gmail.com> writes: > Actually we had to solve a issue with slow SELECT. The problem was in > low value of JOIN_COLLAPSE_LIMITS. Can we increase a default of this > value. I checked some complex query, and planner needed about 200ms > for JOIN_COLLAPSE_LIMIT = 16. So some around 12 can be well.
I'd like to see a rather larger survey of cases before changing that. Also, amount of memory consumed is at least as large a concern here as runtime. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers