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Re: Regression: 8.3 2 seconds -> 8.4 100+ seconds - Mailing list pgsql-performance

From Pavel Stehule
Subject Re: Regression: 8.3 2 seconds -> 8.4 100+ seconds
Date
Msg-id AANLkTimzhZr2ZjAQFRP100nrEM=1xqHN=xOa13OYC25=@mail.gmail.com
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In response to Regression: 8.3 2 seconds -> 8.4 100+ seconds  (Francisco Reyes <lists@stringsutils.com>)
List pgsql-performance
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Hello

>
> The 8.4 machines have more memory than the 8.3.7 and are in general much
> better machines.
> 8.4 settings
> Shared_buffers 18GB
> effective_cache_size 18GB
>
> Machines have 72GB of RAM
> Tried turning off sequential scan on the 8.4.5 and that did not help.
>
> Any ideas/suggestions?
>

increase statistics on columns. The estimation is totally out.

Regards

Pavel Stehule

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