Oracle-L: Re: Oh Where Oh Where Is My Redo Coming From

From: M Rafiq <rafiq9857_at_hotmail.com>
Date: Fri, 21 Feb 2003 09:44:02 -0800
Message-ID: <F001.00554C77.20030221094402@fatcity.com>

Indexes on such tables which has DML...

Regards
Rafiq

Reply-To: ORACLE-L_at_fatcity.com
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: Fri, 21 Feb 2003 07:44:18 -0800

Just had a thought here, have not tried it yet. I have a database that I am working with that is generating 28 GB of redo each day. I would really like to know what objects are generating all this redo without going through the hassle of mining a bunch of log files. It occurred to me that if table monitoring is active and my stats are up to date I should be able to multiply the total number of updates, inserts and commits by the average row size and get a rough % of what objects are generating the most redo.

I am sure there are a number of other factors I need to consider, any ideas what they are?

Should I weight inserts, updates and deletes?
??

The goal is to identify the objects, then identify the jobs that work on those objects and see if I can reduce redo. I suspect a lot of this redo is being generated because of some poor design issues.

Thanks!

Ethan -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Post, Ethan INET: Ethan.Post_at_ps.net

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Author: M Rafiq
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Received on Fri Feb 21 2003 - 11:44:02 CST