Re: Index behavior

Jeff's paper (and other relevant ones) can be found on Tim Gorman's site (www.evdbt.com).

Daniel Fink

"Goulet, Dick" wrote:

> Sami,
>
> Your problem is not with the index, but rather the cost based optimizer. Most of us have been beat severely over the head and shoulders through the years that full table scans are a BAD thing, me included BTW. Well, it's time for the old dog to learn new tricks. So that I'm not a long winded person, take a look in Select magazine, 3rd qtr 2003, for the article "In Defense of Full Table Scans" by Jeff Maresh. For a long time the CBO was a mystery to me as well especially when it did unexpected things like this. I've applied Jeff's ideas on computing an index's efficiency to see if it explained what the CBO did. Amazingly in 95% of the cases I've analyzed it made absolute sense.
>
> I'm including Jeff with a courtesy copy of this message so that 1) I can pat him for making the waters clear and 2) so he can add anything he desires.
>
> Dick Goulet
> Senior Oracle DBA
> Oracle Certified 8i DBA

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Author: Daniel Fink
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