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


Dennis Williams 
DBA, 40%OCP 
Lifetouch, Inc. 
[EMAIL PROTECTED] 

-----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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