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Re: View performance

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Bruno Wolff III <bruno(at)wolff(dot)to>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: View performance
Date: 2002-12-26 19:50:14
Message-ID: (view raw or whole thread)
Lists: pgsql-performance
Bruno Wolff III <bruno(at)wolff(dot)to> writes:
> By disabling merge joins and using the updated view, I got the query down
> to about 25% of its original runtime.
> Note the query estimate is off by a factor of more than 10.

This seems to indicate some estimation problems in cost_hashjoin; the
estimated cost for the hashjoin is evidently a lot higher than it should

Are you interested in digging into this; or could you send me a dump of
the tables used in the view and query, so I could look into it?

			regards, tom lane

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