RE: Checking the rebuildability of an index

Ethan,

With due respect to both Tom Kyte and Jonathan Lewis,if database has tables with lot of deletions like Oracle Financials 'INTERFACE' tables, regular rebuilding of indexes really help in keeping good performance and release of good amount of space. If you don't rebuild indexes for a while on such tables then performance degrades very fast.

Regards
Rafiq

Reply-To: ORACLE-L_at_fatcity.com
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: Tue, 06 Aug 2002 10:38:23 -0800

If memory serves correct (and it might not) both Tom Kyte and Jonathan Lewis have stated that in most circumstances rebuilding indexes is useless. I think Tom may have said he could count the # of times he had to rebuild an index on one hand (something like that). Thus, I have stopped worrying about this one so much and will only entertain rebuilds if I start to see performance issues. Of course if you have the time and need to look busy keep rebuilding those indexes :)

By the way the reason it is useless is not that there is never a performance gain but that most indexes that need to be rebuild quickly degrade again and the period that one experiences a performance gain is minimal. Operating off a poor memory here so hopefully I have not misrepresented anyone.

Ethan Post
perotdba (AIM), epost1 (Yahoo)

-----Original Message-----
Sent: Tuesday, August 06, 2002 1:05 PM
To: Multiple recipients of list ORACLE-L

Actually, I do the 'validate structure' as well, and neglected to include it in my previous post.

Jared

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Author: Mohammad Rafiq
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