On Tue, Apr 20, 2010 at 12:47 PM, David Kerr <dmk@xxxxxxxxxxxxxx> wrote: > On Tue, Apr 20, 2010 at 02:15:19PM -0400, Robert Haas wrote: > - On Tue, Apr 20, 2010 at 2:03 PM, David Kerr <dmk@xxxxxxxxxxxxxx> wrote: > - > that thought occured to me while I was testing this. I ran a vacuumdb -z > - > on my database during the load and it didn't impact performance at all. > - > - The window to run ANALYZE usefully is pretty short. If you run it > - before the load is complete, your stats will be wrong. If you run it > - after the select statements that hit the table are planned, the > - updated stats won't arrive in time to do any good. > > right, but i'm loading 20 million records in 1000 record increments. so > the analyze should affect all subsequent increments, no? I keep thinking FK checks are taking a long time because they aren't cached because in import they went through the ring buffer in pg or some other way aren't in a buffer but large effective cache size says it's 99.99% chance or better that it's in cache, and chooses a poor plan to look them up. Just a guess. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
