On 05/12/2011 11:07 AM, Tom Lane wrote:
I find it odd that replacing the subquery with a temp table helps, though, because (unless you stuck in an ANALYZE you didn't mention) it would have no stats at all about the number of groups in the temp table.
I did have an analyze initially for exactly that reason. But what I found odd is that in my rush to execute this for the end of day reports, I forgot that step, and it still ran fine. I've found that the planner tends to treat un-analyzed tables somewhat pessimistically, which is fine by me.
-- Shaun Thomas OptionsHouse | 141 W. Jackson Blvd. | Suite 800 | Chicago IL, 60604 312-676-8870 sthomas@xxxxxxxxx ______________________________________________ See http://www.peak6.com/email_disclaimer.php for terms and conditions related to this email -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
