Re: Setting Shared-Buffers

Thnks for the replyies.
It's a slony slave db, for reporting.

So, what's a good value to set to effective_cache_size with 10 Gb RAM?

On Thu, Jul 9, 2009 at 9:05 PM, Scott Mead <scott(dot)lists(at)enterprisedb(dot)com>wrote:

>
> On Thu, Jul 9, 2009 at 6:18 PM, Rafael Domiciano <
> rafael(dot)domiciano(at)gmail(dot)com> wrote:
>
>> Hello People,
>>
>> Today, I've upgraded a dedicated postgres server, from 2 Gb to 10 Gb.
>> Everything gone well.
>>
>> But, I would like shared buffers to use at least 5 Gb of the total memory.
>>
>
> What's your workload? Is this db primarily for reporting or OLTP?
>
> If you have an OLTP style workload, I wouldn't recommend going much
> over 2.5 - 4 GB (depending on your specific workload). Just set your
> 'effective_cache_size' higher. This tells postgres how much memory that the
> OS has for caching and the database will perform better.
>
>> Linux Fedora Core 9
>> postgres=# select version();
>> version
>>
>> ---------------------------------------------------------------------------------------------------
>> PostgreSQL 8.3.5 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 4.3.0
>> 20080428 (Red Hat 4.3.0-8)
>> (1 row)
>>
>
> 32 bit pg can't address that much memory. You'd need to recompile or
> download the 64 bit packages. I believe you'd need to dump / reload as
> well, but I may be off about that one.
>
>
> --Scott
>
>