[EMAIL PROTECTED] wrote: > > An example on my understanding of Reverse Key Indices: > > Say you have a table EMP with a column EMPNO, and an index on this > field.This number is incremented sequentially for every new employee that > joins in. And as employees retire, say, the records are deleted. This > would generally mean deletion of records, with lower employee numbers. And > subsequent deletion of indices. As such, deletions from the index are > likely to be concentrated on a small set of leaf blocks towards the > beginning of the index. A reverse key index, which reverses the bytes for > the column value, could help in uniformly dividing the deletions across > various branches of the index, and avoid a skewed index. > > Raj
Raj, I would rather tend to see the benefits in terms of contention avoidance when inserting (typically when the PK is sequence-generated), but by and large I share your view. -- Regards, Stephane Faroult Oriole Software -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Stephane Faroult INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
