RE: RBO to CBO migration books/ material

From: John Kanagaraj <john.kanagaraj_at_hds.com>
Date: Thu, 13 Nov 2003 07:49:25 -0800
Message-ID: <F001.005D68FC.20031113074925@fatcity.com>

Suhen,

>Any good books available to convert applications from RBO to CBO. >References to Oracle 9i.

I am not aware of any book, but there is a limited number of articles/papers (most well-known is Tim Gorman's 'Search for intelligent life in the CBO' at http://www.evdbt.com) that can point you in the right direction. My humble addition is the one at http://www.geocities.com/john_sharmila/links.htm - there are a number of ML articles on the CBO itself that will help: Doc ID: 35934.1 is a good one to start. I would personally do the following:

• Trace all SQL coming into a live RBO-only system
• Identify any code that uses the RULE Hint (in spite of being in a RULE based DB)
• Create a clone of prod on a server of the same or similar capacity
• Collect Statistics (COMPUTE if you can)
• Set the OPTIMIZER_MODE to CHOOSE; review/reset other CBO related parameters (see my paper)
• Let the Developers and UA testers loose on that Db
• Use Cary's method to identity the top set of business processes and determine if the performance is Ok
• If not Ok, then tune it...

All the best!
John Kanagaraj
DB Soft Inc
Phone: 408-970-7002 (W)

Disappointment is inevitable, but Discouragement is optional!

• The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: John Kanagaraj INET: john.kanagaraj_at_hds.com

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