Re: Same query doing slow then quick

From: Julien Cigar <jcigar(at)ulb(dot)ac(dot)be>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: Same query doing slow then quick
Date: 2012-09-26 14:52:33
Message-ID: 506316B1.70900@ulb.ac.be
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On 09/26/2012 16:41, FFW_Rude wrote:
> Ok done to 512Mb and 2048Mb
>
> I'm relaunching. See you in a few hours (so tommorrow)

with 250 000 rows and proper indexes it should run in less than a second.
be sure your indexes are set properly and that they're used (use EXPLAIN
ANALYZE for that) within your query ...

>
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>
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>
> ------------------------------------------------------------------------
> Date: Wed, 26 Sep 2012 07:17:56 -0700
> From: [hidden email] </user/SendEmail.jtp?type=node&node=5725518&i=0>
> To: [hidden email] </user/SendEmail.jtp?type=node&node=5725518&i=1>
> Subject: Re: Same query doing slow then quick
>
> On 09/26/2012 16:14, FFW_Rude wrote:
> > Thank for you answer.
> >
> > shared_buffer is at 24Mb
> > effective_cache_size at 2048Mb
> >
> > What do you mean properly ? That's not really helping a novice...
> >
>
> from my previous mail:
>
> before looking further, please configure shared_buffers and
> effective_cache_size properly, it's fundamental
> you'll probably need to raise SHMALL/SHMMAX, take a look at:
> http://www.postgresql.org/docs/current/static/kernel-resources.html
> for 4GB of RAM I would start with shared_buffers to 512MB and
> effective_cache_size to 2GB
>
> >
> >
> > --
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> Nabble.com.
> >
> >
>
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