RE: Table - Extents

Anand - This was the common wisdom several years ago. I used to rebuild tables based on rules of thumb like this. Recently, several leading experts have challenged this assumption, and now it is generally accepted that trying to keep the number of extents below 5 wastes a lot of work for nothing. Here are links to papers by Tim Gorman and Cary Millsap that discuss this in more detail.  

http://www.evdbt.com/MythsExtPerf.doc


<http://www.evdbt.com/MythsExtPerf.doc> 

http://www.dbatoolbox.com/WP2001/spacemgmt/Myths%20About%20Extents.pdf

Dennis Williams
DBA, 40%OCP
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Saturday, November 30, 2002 11:39 AM To: Multiple recipients of list ORACLE-L

Is there any restriction that the segments shouldn't cross more than 5 extents in oracle 7.3.  

Pl. help me, as I heard from somebody that the segments shouldn't cross more than 5 extents and my indexes are in more than 20 extents.  

Thanks in advance  

Anand Kumar
DBA
ITW Signode India Ltd

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