Dave, Is it me or are the two examples you attached returning different row counts? That means either the source data is different, or your queries are.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dave Dutcher Sent: Thursday, January 04, 2007 5:32 PM To: pgsql-performance@postgresql.org Subject: [PERFORM] Slow Query on Postgres 8.2 Hello, I am looking at upgrading from 8.1.2 to 8.2.0, and I've found a query which runs a lot slower. Here is the query: select type, currency_id, instrument_id, sum(amount) as total_amount from om_transaction where strategy_id in ('BASKET1','BASKET2','BASKET3','BASKET4','BASKET5','BASKET6','BASKET7',' BASKET8','BASKET9','BASKET10','BASKET11') and owner_trader_id in ('dave','sam','bob','tad', 'tim','harry','frank','bart','lisa','homer','marge','maggie','apu','milh ouse','disco stu') and cf_account_id in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,29) and as_of_date > '2006-12-04' and as_of_date <= '2006-12-05' group by type, currency_id, instrument_id; I changed the values in the in statements to fake ones, but it still takes over three seconds on 8.2, where 8.1 only takes 26 milliseconds. When I increase the number of valules in the IN clauses, the query rapidly gets worse. I tried increasing my stats target to 1000 and analyzing, but that didn't help so I put that back to 10. While the query is running the CPU is at 100%. Is there a more efficient way to write a query like this? I've attached the output from EXPLAIN ANALYZE in a file because it is somewhat large. Thanks, Dave Dutcher Telluride Asset Management 952.653.6411
