Re: increasing shared buffers: how much should be removed from OS filesystem cache? - Mailing list pgsql-performance

On 1-Sep-06, at 3:49 PM, Merlin Moncure wrote:

> On 01 Sep 2006 19:00:52 +0200, Guillaume Cottenceau <gc@mnc.ch> wrote:
>> Hi,
>>
>> I've been looking at the results from the pg_statio* tables, to
>> view the impact of increasing the shared buffers to increase
>> performance.
>>
>
> I think 'shared buffers' is one of the most overrated settings from a
> performance standpoint.  however you must ensure there is enough for
> things the server does besides caching.  It used to be a bigger deal
> than it is in modern versionf of postgresql modern operating systems.
>
> merlin
>
So if shared buffers is the most overrated, what do you consider the
proper way of tuning ?
> ---------------------------(end of
> broadcast)---------------------------
> TIP 9: In versions below 8.0, the planner will ignore your desire to
>       choose an index scan if your joining column's datatypes do not
>       match
>