> Also, try replacing the DISTINCT with GROUP BY. The code path for DISTINCT > unfortunately needs a bit of cleaning up and isn't exactly equivalent to GROUP > BY. In particular it doesn't support hash aggregates which, if your work_mem > is large enough, might work for you here. Sorry, strike that last suggestion. I was looking at the plan and forgot that the query had DISTINCT ON. It is possible to replace DISTINCT ON with GROUP BY but it's not going to be faster than the DISTINCT ON case since you'll need the sort anyways. Actually it's possible to do without the sort if you write some fancy aggregate functions but for this large a query that's going to be awfully complex. -- Gregory Stark EnterpriseDB http://www.enterprisedb.com Get trained by Bruce Momjian - ask me about EnterpriseDB's PostgreSQL training! ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
