Message-ID: <50630E6F.5040605@ulb.ac.be>
Date: Wed, 26 Sep 2012 16:17:19 +0200
From: Julien Cigar <jcigar@ulb.ac.be>
Organization: Belgian Biodiversity Platform
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To: pgsql-performance@postgresql.org
Subject: Re: Same query doing slow then quick
References: <1348662446741-5725486.post@n5.nabble.com>
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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

>
>
> --
> View this message in context: http://postgresql.1045698.n5.nabble.com/Same-query-doing-slow-then-quick-tp5725486p5725505.html
> Sent from the PostgreSQL - performance mailing list archive at Nabble.com.
>
>


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