Re: Setting Shared-Buffers - Mailing list pgsql-admin

On Thu, Jul 9, 2009 at 6:18 PM, Rafael Domiciano <rafael.domiciano@gmail.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