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When does Oracle use 'Index Fast Scan'

From: Ryan <ryan.gaffuri_at_cox.net>
Date: Mon, 26 Jan 2004 18:24:27 -0800
Message-ID: <F001.005DE292.20040126182427@fatcity.com>








I have found that the vast majority of time that Oracle chooses this method, my statistics are stale and the query is sub-optimal. One time, Oracle changed from a 'range scan' to this type of scan with a FIRST_ROWS hint and this reduced performance.
 
This is just a full scan of the index, one block at a time right? When would this ever be superior to a Fast Full Scan or a Range Scan?
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Author: Ryan
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Received on Mon Jan 26 2004 - 20:24:27 CST

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