Horton

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

Craig Ringer <ringerc@ringerc.id.au>

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From: Craig Ringer <ringerc@ringerc.id.au>
To: Samuel Gendler <sgendler@ideasculptor.com>, "pgsql-general@postgresql.org" <pgsql-general@postgresql.org>
Date: 2012-07-06T03:02:34Z
Lists: pgsql-performance, pgsql-general 
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

Commits

  1. Support index-only scans using the visibility map to avoid heap fetches.