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Re: Limited Shared Buffer Problem

From: "**Rod MacNeil" <rmacneil(at)interactdirect(dot)com>
To: Richard Neill <rn214(at)cam(dot)ac(dot)uk>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Limited Shared Buffer Problem
Date: 2010-01-29 18:36:12
Message-ID: 81b7095b1001291036s767b6332q4825ec8d8067baeb@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
Thanx, I will try out that recommendation.


On Fri, Jan 29, 2010 at 11:53 AM, Richard Neill <rn214(at)cam(dot)ac(dot)uk> wrote:

>
>
> **Rod MacNeil wrote:
>
>> Hi All,
>>
>> I have a server running CentOS5 with 6gb of memory that will run postgres
>> 8.3 exclusively.
>> I would like to allocate 4gb of the memory to shared buffers for postgres.
>>
>
> It might be worth pausing at this point:
>
> The various postgresql tuning guides usually suggest that on a dedicated
> system, you should give postgres about 1/4 of the RAM for shared buffers,
> while telling it that the effective_cache_size = 1/2 RAM.
>
> Postgres will make good use of the OS cache as a file-cache - the
> "effective_cache_size" setting is advisory to postgres that it can expect
> about this much data to be in RAM.
>
> Also, If you are setting up a new system, it's probably worth going for
> 8.4.2. Postgres is relatively easy to build from source.
>
> HTH,
>
> Richard
>
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-- 
Rod MacNeil
Senior Software Engineer
Interact Direct Marketing, Inc.
www.interactdirect.com
rmacneil(at)interactdirect(dot)com
Primary Phone Mississauga Ontario: 905-278-4086
Alternate Phone London Ontario: 519-438-6245, Ext 183

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