Re: Count(*) not doing a FTS??

AFAIK the segment header does not have a row count, only the number of blocks 
below hwm. But on the matter of count(*) not doing a FTS, that is correct. 
Oracle will use an index when possible.

Quoting rjamya <rjamya@xxxxxxxxx>:

> I am sitting in a class and instructor told us that count(*) reads
> rowcount from segment header in some (or most?) cases rather than
> doign the good ol' FTS. He can't remember exact details, so this email
> ....
> 
> is it true? Which version was this introduced? Someone has a
> reproducible test case?
> 
> Thanks in advance
> Raj
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-- 
regards

Wolfgang Breitling
Oracle 7,8,8i,9i OCP DBA
Centrex Consulting Corporation
www.centrexcc.com

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