From: | Ioannis Anagnostopoulos <ioannis(at)anatec(dot)com> |
---|---|
To: | Rosser Schwarz <rosser(dot)schwarz(at)gmail(dot)com> |
Cc: | Claudio Freire <klaussfreire(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org |
Subject: | Re: A very long running query.... |
Date: | 2012-07-20 21:53:46 |
Message-ID: | 5009D36A.10506@anatec.com |
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Lists: | pgsql-novice pgsql-performance |
On 20/07/2012 22:33, Rosser Schwarz wrote:
> On Fri, Jul 20, 2012 at 2:27 PM, Ioannis Anagnostopoulos
> <ioannis(at)anatec(dot)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?
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