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From: Kris Jurka <books@ejurka.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-performance@postgresql.org
Subject: Re: No hash join across partitioned tables?
Date: Fri, 17 Apr 2009 08:07:21 -0700
Message-ID: <49E89B29.10705@ejurka.com> (raw)
In-Reply-To: <21238.1239980554@sss.pgh.pa.us>
References: <Pine.BSO.4.64.0904161836540.11937@leary.csoft.net>
	<7163.1239923531@sss.pgh.pa.us>
	<Pine.BSO.4.64.0904161921080.11937@leary.csoft.net>
	<Pine.BSO.4.64.0904162046050.27034@leary.csoft.net>
	<21238.1239980554@sss.pgh.pa.us>

Tom Lane wrote:

> Is there another issue here besides that one?  I think you were hoping
> that the hash join would be faster than the alternatives, but the cost
> estimate says it's a lot slower.  Is that actually the case?
> 

The hash join takes less than twenty seconds, the other two joins I 
killed after five minutes.  I can try to collect explain analyze results 
later today if you'd like.

Kris Jurka

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