Message-ID: <5009D36A.10506@anatec.com>
Date: Fri, 20 Jul 2012 22:53:46 +0100
From: Ioannis Anagnostopoulos <ioannis@anatec.com>
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To: Rosser Schwarz <rosser.schwarz@gmail.com>
CC: Claudio Freire <klaussfreire@gmail.com>, pgsql-performance@postgresql.org
Subject: Re: A very long running query....
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On 20/07/2012 22:33, Rosser Schwarz wrote:
> On Fri, Jul 20, 2012 at 2:27 PM, Ioannis Anagnostopoulos
> <ioannis@anatec.com> wrote:
>> On 20/07/2012 22:23, Claudio Freire wrote:
>>> Misestimated row counts... did you try running an analyze, or upping
>>> statistic targets?
>> I have run analyse every so often. I think the problem is that as I get 16K
>> new rows every minutes, the "stats" are always out... Possible?
> It may not help much with any skew in your data that results from
> divergent data appearing, but you can update the statistics targets
> for those columns and analyze again, and the planner should have much
> better information about the distributions of their data.  The max
> stats target is 10000, but the default is 100.  Increasing it even
> just to 500 or 1000 should help the planner significantly.
>
> rls
>
I suppose that this is some kind of postgres.conf tweak?