RE: os cache vs. db cache

Hi Robyn,  

This is pretty dated, but still accurate, I think:

http://www.ixora.com.au/tips/avoid_buffered_io.htm  

-Mark  

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Mark J. Bobak
Senior Database Administrator, System & Product Technologies ProQuest
789 E. Eisenhower, Parkway, P.O. Box 1346 Ann Arbor MI 48106-1346
734.997.4059 or 800.521.0600 x 4059
mark.bobak_at_il.proquest.com <mailto:mark.bobak_at_il.proquest.com> www.proquest.com <http://www.proquest.com> www.csa.com <http://www.csa.com>

ProQuest...Start here.  

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Robyn Sent: Monday, July 09, 2007 2:04 PM
To: oracle-l
Subject: os cache vs. db cache  

Hello everyone,

Over the years, I've read differing opinions on balancing the os cache and the database cache. Seems like I remember there were some advocates for minimizing the os cache and maximizing the database cache to allow Oracle to better determine which blocks should truly be cached and avoid necessary blocks being cached because they were in proximity to hot data. I also have heard opposite opinions.

I'm specifically focused on performance for a data warehouse. Has anyone tested performance with a minimized OS cache and a maximized database cache? If so, what were the results? Does anyone have a really good paper or book on the topic? I'm trying to collect some information before I start discussions with the platforms guys.

tia ... Robyn

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http://www.freelists.org/webpage/oracle-l Received on Mon Jul 09 2007 - 14:03:21 CDT