Le mercredi 14 Juillet 2004 12:13, Shridhar Daithankar a écrit :
> gnari wrote:
> > is there a recommended procedure to estimate
> > the best value for effective_cache_size on a
> > dedicated DB server ?
>
> Rule of thumb(On linux): on a typically loaded machine, observe cache
> memory of the machine and allocate good chunk of it as effective cache.
>
> To define good chunck of it, you need to consider how many other things are
> running on that machine. If it is file server + web server + database
> server, you have to allocate the resources depending upon requirement.
>
> But remember It does not guarantee that it will be a good value. It is just
> a starting point..:-) You have to tune it further if required.
In my case it's a PostgreSQL dedicated server ...
effective_cache_size = 5000000
For me I give to the planner the information that the kernel is able to cache
5000000 disk page in RAM
>free
total used free shared buffers cached
Mem: 7959120 7712164 246956 0 17372 7165704
-/+ buffers/cache: 529088 7430032
Swap: 2097136 9880 2087256
What should I put ?
Regards,
--
Hervé Piedvache
Elma Ingénierie Informatique
6 rue du Faubourg Saint-Honoré
F-75008 - Paris - France
Pho. 33-144949901
Fax. 33-144949902
