Re: Same query doing slow then quick

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От Julien Cigar
Тема Re: Same query doing slow then quick
Дата
Msg-id 506316B1.70900@ulb.ac.be
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Ответ на Re: Same query doing slow then quick  (FFW_Rude <FFW_Rude@hotmail.com>)
Ответы Re: Same query doing slow then quick
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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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Date: Wed, 26 Sep 2012 07:17:56 -0700
From: [hidden email]
To: [hidden email]
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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> 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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