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Re: [PERFORM] The need for clustered indexes to boost TPC-V performance

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To: Samuel Gendler <sgendler@xxxxxxxxxxxxxxxx>, "pgsql-general@xxxxxxxxxxxxxx" <pgsql-general@xxxxxxxxxxxxxx>
Subject: Re: [PERFORM] The need for clustered indexes to boost TPC-V performance
From: Craig Ringer <ringerc@xxxxxxxxxxxxx>
Date: Fri, 06 Jul 2012 11:02:34 +0800
In-reply-to: <CAEV0TzCi3Bh2xK84dS4V=LOoy-ZeggGCGcUeHf8hnH118pzOzg@mail.gmail.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0

On 07/06/2012 09:33 AM, Samuel Gendler wrote:

Some other potential issues - with only 10MB of work_mem, you might be gong to temp space on disk more than you realize. Explain analyze might reveal that, but only if you happen to pick a query that exceeds work_mem on at least one step.

Rather than hunting blindly with EXPLAIN ANALYZE it's better to just turn log_temp_files on and see what's reported.

--
Craig Ringer

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