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RE: Where To Use Additional Memory

From: Guang Mei <>
Date: Wed, 8 Dec 2004 10:20:48 -0500
Message-ID: <>

Hi Patty,

Adding more physical memory != better performance.

You need to figure out where your performance problem is (assuming there is a problem) before finding a solution.

Also some init.ora parameters and (and probably) some system parameters need to be changed, so oracle DB can use more physical memory.

HTH. Guang

-----Original Message-----
[]On Behalf Of
Sent: Wednesday, December 08, 2004 10:03 AM To:
Subject: Where To Use Additional Memory

Recently my manager stopped by my desk and asked why the additional 2 Gb=20= of memory the Sysadmin added to the production server was not improving=20= our OLTP transaction response time=2E Ok course I had no idea that any=20= additional memory had been added to the server so I am obviously not using=20=
it for the database=2E=2E=2E

We are new to Oracle 9=2E2 (9=2E2=2E0=2E5) and AIX 5L (5=2E2)=2E I have read all=

about the new 'advice' catalog views and memory management in 9i=2E=20=

I have a few questions:=20=

  1. How safe is it to turn on db_cache_advice during peak transaction=20= periods?
  2. How reliable/useful are the stats that I see out of the V$ advice=20= views?
  3. Does anyone have a tried and true method for determining the best place=20= to use additional physical free memory?

TIA=2E=2E=2E Patty

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Received on Wed Dec 08 2004 - 09:20:48 CST

Original text of this message