Re: Sharedbuffers and WorkMem

On Tue, Oct 20, 2009 at 4:22 PM, Waldomiro <waldomiro(at)shx(dot)com(dot)br> wrote:

> Hi everybody,
>
> I have some doubts about sharedmemory and work_mem.
>
> I have a server:
>
> 64 GB RAM
> 2 processors 4 cores each one intel xeon 3 Ghz
> expecting 300 users in the same time
>
> So, I put in sharedbuffers the same size my two biggest tables, which are
> the most read too. 11 GB + 4 GB. total shared buffers = 15 GB
>
> After that I put 100 MB to each expected user, 300 * 100 MB = 30 GB
>
> So, I used only 30 GB + 15GB = 45 GB total RAM
>
> My doubt is, can I use more RAM for shared buffers? about 30 GB (50% of
> total RAM)?
>
> What is the max shared buffers I can use? How can I calculate that?
>
> what's the db version? what OS ?
have you tried pgtune ? (if db 8.3 or 8.4)

--
GJ