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List:       pgsql-performance
Subject:    Re: [PERFORM] Query w empty result set with LIMIT orders of magnitude slower than without
From:       "Frank Joerdens" <frank () joerdens ! de>
Date:       2008-08-26 18:41:49
Message-ID: 7d10d2df0808261141k4ca6800dm5c847098af8da51d () mail ! gmail ! com
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On Tue, Aug 26, 2008 at 5:53 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> "Frank Joerdens" <frank@joerdens.de> writes:
>> It seems to me that the planner makes a very poor decision with this
>> particular query:
>
> Try increasing the stats on woouser.  You need it to make a smaller
> estimate of the number of matching rows here:

Way cool, this

alter table webapp_invite alter column woouser set statistics 50;

did the trick, without cleaning up the spurious join there even.

Thanks!

Frank

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