Re: Increasing the shared memory

Thanks,

I've a value of 1000 set for shared_buffers, does this means
that I use 8kbX1000=8Mb of Shared Mem?

The definition from the manual is quite confusing:

shared_buffers (integer)

Sets the amount of memory the database server uses for shared memory
buffers. The default is typically 32 megabytes (32MB), but may be less if
your kernel settings will not support it (as determined during initdb). This
setting must be at least 128 kilobytes and at least 16 kilobytes times
max_connections
<http://www.postgresql.org/docs/current/static/runtime-config-connection.htm
l#GUC-MAX-CONNECTIONS> .

What does the integer number represent? Number of shared buffers? If yes,
what size does each shared buffer have?

"The default is typically 32 megabytes" suggests that this integer could
also represent the number of megabytes?!?

In the postgresql.conf file is an ambiguous comment that could induce the
idea that each shared buffer has 8 kb.

So, which is the meaning of this integer?

Thanks.

S.

_____

From: Shoaib Mir [mailto:shoaibmir(at)gmail(dot)com]
Sent: Monday, April 02, 2007 1:01 PM
To: Sorin N. Ciolofan
Cc: pgsql-general(at)postgresql(dot)org; pgsql-admin(at)postgresql(dot)org
Subject: Re: [ADMIN] Increasing the shared memory

I guess shared_buffers (in postgresql.conf file) will help you here if you
have properly setup your kernel.SHMMAX value.

--
Shoaib Mir
EnterpriseDB (www.enterprisedb.com )

On 4/2/07, Sorin N. Ciolofan <ciolofan(at)ics(dot)forth(dot)gr> wrote:

Hello!

I'd like to ask you if there is any Postgre configuration parameter (like
the ones defined in postgresql.conf file) that could be used for increasing
the shared memory for Postgre?

Thank you very much

With best regards,

Sorin