Re: 7k records into Sort node, 4.5m out?

From: Christophe Pettus <xof(at)thebuild(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: 7k records into Sort node, 4.5m out?
Date: 2012-08-15 19:13:19
Message-ID: 623F2FF3-B79D-419A-929A-41C707DD5EA3@thebuild.com
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On Aug 13, 2012, at 7:11 PM, Tom Lane wrote:
> The whole thing looks a bit weird to me --- why did it not use a
> nestloop join with inner indexscan on charlie? With 7000 rows on the
> other side, the estimated cost for that shouldn't have been more than
> about 30000 ...

Here's the same query with set enable_megejoin = off. All of the other query tuning parameters are default.

http://explain.depesz.com/s/dqO

--
-- Christophe Pettus
xof(at)thebuild(dot)com

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