From: Brendan Duddridge <brendan@clickspace.com>
To: Josh Berkus <josh@agliodbs.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Query using SeqScan instead of IndexScan
Date: Sun, 2 Apr 2006 22:20:00 -0600
Message-ID: <D2D8034B-4619-4D2A-93E3-BA7FA8FBA98E@clickspace.com> (raw)
In-Reply-To: <200604021530.55251.josh@agliodbs.com>
References: <2F1712F1-E5E2-455E-A291-06F300A66549@clickspace.com>
<200603292118.50033.josh@agliodbs.com>
<DFA31453-E99A-4BB9-80C7-520E0C72CAFA@clickspace.com>
<200604021530.55251.josh@agliodbs.com>
Hi Josh,
Thanks. I've adjusted my effective_cache_size to 5 GB, so we'll see
how that goes.
I'm also doing some query and de-normalization optimizations so we'll
see how those go too.
____________________________________________________________________
Brendan Duddridge | CTO | 403-277-5591 x24 | brendan@clickspace.com
ClickSpace Interactive Inc.
Suite L100, 239 - 10th Ave. SE
Calgary, AB T2G 0V9
http://www.clickspace.com
On Apr 2, 2006, at 4:30 PM, Josh Berkus wrote:
> Brendan,
>
>> But just as a follow up question to your #1 suggestion, I have 8 GB
>> of ram in my production server. You're saying to set the
>> effective_cache_size then to 5 GB roughly? Somewhere around 655360?
>> Currently it is set to 65535. Is that something that's OS dependent?
>> I'm not sure how much memory my server sets aside for disk caching.
>
> Yes, about. It's really a judgement call; you're looking for the
> approximate
> combined RAM available for disk caching and shared mem. However,
> this is
> just used as a way of estimating the probability that the data you
> want is
> cached in memory, so you're just trying to be order-of-magnitude
> accurate,
> not to-the-MB accurate.
>
> --
> Josh Berkus
> Aglio Database Solutions
> San Francisco
>
> ---------------------------(end of
> broadcast)---------------------------
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To: pgsql-performance@postgresql.org
Cc: brendan@clickspace.com, josh@agliodbs.com
Subject: Re: Query using SeqScan instead of IndexScan
In-Reply-To: <D2D8034B-4619-4D2A-93E3-BA7FA8FBA98E@clickspace.com>
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