RE: Calculating Physical memory for Oracle Sessions

From: VIVEK_SHARMA <VIVEK_SHARMA_at_infosys.com>
Date: Thu, 30 Nov 2006 13:52:37 +0530
Message-ID: <BBD944BCAC3AB4499DFBAFB1D8AF3020022D2F05@BLRKECMSG11.ad.infosys.com>

Hi Tim

What does "Max Shm Kb" stand for? Is it Maximum Shared Memory of Both Oracle Foreground + Background processes?

What is "Maximum" trying to Convey?

2) Does "Sum Priv Kb" stand for Total Private Memory of Only the Oracle Foreground Processes?

Output of your Script:-

Total RAM = 32768Mb, Swap = 2854.48Mb used, 89370.20Mb free

Total memory consumption by Oracle instance "FTFXEMC":

# Procs # Procs Max Sum

Foregrnd Backgrnd Shm Kb Priv Kb Total Kb

======== ====== ======= ========

7                        6                     623808          49280

673088

Thanks

From: VIVEK_SHARMA
Sent: Thursday, November 30, 2006 11:58 AM To: 'tim_at_evdbt.com'; ORACLE-L
Subject: RE: Calculating Physical memory for Oracle Sessions

Hi Tim

Could you possibly Share the HPUX Custom Built script please?

Thanks indeed

Vivek

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Tim Gorman Sent: Thursday, November 30, 2006 9:51 AM To: ORACLE-L
Cc: anuragdba_at_gmail.com
Subject: Re: Calculating Physical memory for Oracle Sessions

Anurag,

I have this shell script named "oramem.sh" posted online at http://www.EvDBT.com/tools.htm. It was originally written for Solaris using the excellent "pmap" utility. It can work with Linux if the SYSSTAT rpms are installed, which include "pmap". I have an alternate version for HPUX that uses some custom-built "C" programs. I don't have a version for AIX at all, as I haven't found anything similar to "pmap" on AIX.

Hope this helps...

--

Tim Gorman
consultant - Evergreen Database Technologies, Inc.

website = http://www.evdbt.com
email   = tim_at_evdbt.com
mobile  = +1-303-885-4526
fax     = +1-303-484-3608

Anurag Verma wrote:

Hi All,

My 9.2.0.7 database has an sga size of 1.3 GB and the RAM size is 4096 MB.

We were facing a problem of memory contention yesterday due to the increased number of sessions/connections to the database.

96% of the Physical memory and 94-95% of virtual memory was used, when checked the processes in the IBM AIX server.

So when the number of sessions increased, listener stopped receiving newer connections.

The ever increasing number of sessions were taking up the memory.

Latch free contention was there and found library cache latch stats were showing large number of sleeps.

If we need to increase shared pool, memory was not available.

One option we are planning is to increase the physical memory.

So my question is how do we determine the size of the memory used for Oracle sessions.

Say for adding another 100 sessions, how much memory will it take, so that it will help us in adding more RAM in to the server.

Thanks for your thoughts on this.

Anurag

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Received on Thu Nov 30 2006 - 02:22:37 CST