From: Richard Huxton <dev@archonet.com>
To: kevin kempter <kevin@kevinkempterllc.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Join runs for > 10 hours and then fills up >1.3TB of disk space
Date: Fri, 16 May 2008 08:40:16 +0100
Message-ID: <482D3A60.30006@archonet.com> (raw)
In-Reply-To: <CEFBA6FF-0E0A-41A0-959E-7DBBDA296825@kevinkempterllc.com>
References: <CEFBA6FF-0E0A-41A0-959E-7DBBDA296825@kevinkempterllc.com>
kevin kempter wrote:
> Hi List;
>
> I have a table with 9,961,914 rows in it (see the describe of
> bigtab_stats_fact_tmp14 below)
>
> I also have a table with 7,785 rows in it (see the describe of
> xsegment_dim below)
>
> I'm running the join shown below and it takes > 10 hours and eventually
> runs out of disk space on a 1.4TB file system
> QUERY PLAN
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Merge Join (cost=1757001.74..73569676.49 rows=3191677219 width=118)
Dumb question Kevin, but are you really expecting 3.2 billion rows in
the result-set? Because that's approaching 400GB of result-set without
any overheads.
--
Richard Huxton
Archonet Ltd
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To: pgsql-performance@postgresql.org
Cc: dev@archonet.com, kevin@kevinkempterllc.com
Subject: Re: Join runs for > 10 hours and then fills up >1.3TB of disk space
In-Reply-To: <482D3A60.30006@archonet.com>
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