RE: os cache vs. db cache

From: Randy Johnson <randyjo_at_sbcglobal.net>
Date: Mon, 9 Jul 2007 16:20:05 -0500
Message-ID: <003201c7c26e$ec519870$c4fda80a@scraunch>

If you are on 10g you should consider using ASM for storage. If you do this issue goes away altogether since there are no filesystems involved.

Randy Johnson
Sr. Technical Consultant
Enkitec, LLP

Office ..... 817-255-3580
Mobile .... 817-564-6583
Email ..... HYPERLINK

"mailto:randy.johnson_at_enkitec.com"randy.johnson_at_enkitec.com

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Robyn
Sent: Monday, July 09, 2007 1:04 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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Received on Mon Jul 09 2007 - 16:20:05 CDT