> On Mon, Mar 21, 2011 at 11:32 AM, <t...@fuzzy.cz> wrote: >>> Incredible! Setting enable_nestloop off temporarily for the run of >>> this >>> script made it run in less than a minute (had been running in 10 or 11 >>> minutes). I think you have found a solution for many of my slow >>> running >>> scripts that use these same type of joins. Thanks again. >>> Julie >> >> Nice. Can you post EXPLAIN ANALYZE again, so that we can see why this >> plan >> was evaluated as as more expensive before disabling nested loops? > > well the problem is obvious -- the planner is estimating ~ 250 loops, > when it in fact has to do ~ 60k. That's a two orders of magnitude > miss.
Yeah, you're right, although I think the estimate is 1 loop vs. 2882 loops in reality. The 250 vs. 60k is related to the result set. Tomas -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
