Re: Formula for Calculating Maximum Number of Possible Sessions

From: Sybrand Bakker <postbus_at_sybrandb.demon.nl>
Date: Wed, 11 Jan 2006 22:07:14 +0100
Message-ID: <rpsas19tauutdv6ejiacj4qaq2t691fvnr@4ax.com>

On 11 Jan 2006 09:19:12 -0800, "JPinTampa" <JPinTampa_at_hotmail.com> wrote:

>I am looking for a Formula for Determining the Maximum Number of
>Possible Sessions (Dedicated connections) is possible for an Oracle9i
>Database Server.
>
>Looking through the Init Parameters I've determined the Following:
>
>SESSIONS derived: (1.1 * PROCESSES) + 5
>PROCESSES derived from PARALLEL_MAX_SERVERS
>PARALLEL_MAX_SERVERS derived from the values of CPU_COUNT,
>PARALLEL_AUTOMATIC_TUNING, and PARALLEL_ADAPTIVE_MULTI_USER
>
>So if I want n number of SESSIONS how much memory/cpu do I need?

Processes doesn't derive from anything. It is a limit you set in init.ora.
Also there is no formula, as you can't predict how much pga and uga every session is going to use.

--
Sybrand Bakker, Senior Oracle DBA

Received on Wed Jan 11 2006 - 15:07:14 CST