---------- Forwarded message ---------- From: Evan Carroll <me@xxxxxxxxxxxxxxx> Date: Aug 28, 2007 11:23 AM Subject: Re: 8.2 Query 10 times slower than 8.1 (view-heavy) To: Scott Marlowe <scott.marlowe@xxxxxxxxx> On 8/28/07, Scott Marlowe <scott.marlowe@xxxxxxxxx> wrote: > I looked through your query plan, and this is what stood out in the 8.2 plan: > > -> Nested Loop Left Join (cost=8830.30..10871.27 rows=1 > width=102) (actual time=2148.444..236018.971 rows=62 loops=1) > Join Filter: ((public.contact.pkid = > public.contact.pkid) AND (public.event.ts_in > public.event.ts_in)) > Filter: (public.event.pkid IS NULL) > > Notice the misestimation is by a factor of 62, and the actual time > goes from 2149 to 236018 ms. > > Again, have you analyzed your tables / databases? > contacts=# \o scott_marlowe_test contacts=# VACUUM FULL ANALYZE; contacts=# SELECT * FROM test_view WHERE U_ID = 8; Cancel request sent ERROR: canceling statement due to user request contacts=# EXPLAIN ANALYZE SELECT * FROM test_view WHERE U_ID = 8; output found at http://rafb.net/p/EQouMI82.html -- Evan Carroll System Lord of the Internets me@xxxxxxxxxxxxxxx 832-445-8877 -- Evan Carroll System Lord of the Internets me@xxxxxxxxxxxxxxx 832-445-8877 ---------------------------(end of broadcast)--------------------------- TIP 7: You can help support the PostgreSQL project by donating at http://www.postgresql.org/about/donate
