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Re: planer chooses very bad plan

From: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
To: Corin <wakathane(at)gmail(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: planer chooses very bad plan
Date: 2010-04-11 21:18:53
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Lists: pgsql-performance
On Sun, Apr 11, 2010 at 3:12 PM, Corin <wakathane(at)gmail(dot)com> wrote:
> Hi,
> I'm having a query where the planer chooses a very bad plan.

In both instances your number of rows estimated is WAY higher than the
actual number of rows returned.  Perhaps if you increased
default_statistics_target to 100, 200, 500 etc. re-analyzed, and then
reun explain analyze again.

Also increasing work_mem might encourage the bitmap index scans to occur.

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