Re: Bad Plan for Questionnaire-Type Query - Mailing list pgsql-performance

From Tom Lane
Subject Re: Bad Plan for Questionnaire-Type Query
Date
Msg-id 25886.1241728303@sss.pgh.pa.us
Whole thread Raw
In response to Re: Bad Plan for Questionnaire-Type Query  (David Blewett <david@dawninglight.net>)
Responses Re: Bad Plan for Questionnaire-Type Query  (David Blewett <david@dawninglight.net>)
List pgsql-performance
David Blewett <david@dawninglight.net> writes:
> On Thu, May 7, 2009 at 12:53 PM, David Blewett <david@dawninglight.net> wrote:
>> 1. http://dpaste.com/hold/41842/
>> 2. http://explain.depesz.com/s/Wg
>> 3. http://explain.depesz.com/s/1s
>> 4. http://dpaste.com/hold/41846/

> Forgot to mention that I'm using Postgres 8.3.6 on linux 2.6.24.

Well, the reason it likes the nestloop plan is the estimate of just one
row out of the lower joins --- that case is pretty much always going to
favor a nestloop over other kinds of joins.  If it were estimating even
as few as ten rows out, it'd likely switch to a different plan.  So the
question to ask is why the rowcount estimates are so abysmally bad.
You mentioned having tried to increase the stats targets, but without
seeing the actual stats data it's hard to speculate about this.

            regards, tom lane

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