RE: Log file sync and log file parallel write.

Can someone help point me to documentation that will show me the silver bullet for not rebuilding indexes? I can provide countless examples over the past several years where rebuilding indexes corrected performance problems that developed over months. Are we saying that something else fixed the problem and that the index rebuild was not the real solution? Is the index rebuild forcing explain plans out of the shared_pool and giving false results? If so, wouldn't a DB stop/start accomplish the same result? I am by no means an optimizing expert, but won't Oracle switch to something like full table scans if the index is no longer an effective method to obtain your data? This quickly becomes a problem when joining multiple tables with 10+ million rows each. I deal a lot with third party applications like SAP, Click Commerce and Matrix One Engineering modules where we can not alter the sql running behind the scenes.  

I would really like to understand.  

Bill  

From: Jared Still [mailto:jkstill_at_gmail.com] Sent: Wednesday, March 05, 2008 7:39 PM
To: asif_oracle_at_yahoo.com
Cc: Johnson, William L (TEIS); oracle-l_at_freelists.org Subject: Re: Log file sync and log file parallel write.           

	Lastly, why are you rebuilding your indexes???
	Regards
	Asif Momen
	http://momendba.blogspot.com

	 

Same question. Why are you rebuilding the indexes?

You *could* just stop doing that.

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Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist

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http://www.freelists.org/webpage/oracle-l Received on Wed Mar 05 2008 - 19:37:45 CST