Re: Limited Shared Buffer Problem

Richard Neill escribió:
>
>
> **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
>
All these values has to be combined with the others: shared_buffers,
work_mem,etc.
My recommendation is to go down a little the shmmax and the
shared_buffers values.
Is very necessary that you have these values so high?

Regards

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