RE: Checking the rebuildability of an index

OK, but first read the article that Jesse shared, http://asktom.oracle.com/pls/ask/f?p=4950:8:1134696::NO::F4950_P8_DISPLAYID, F4950_P8_CRITERIA:2290062993260,%7Bindex%7D%20and%20%7Brebuild%7D, then tell us why the INTERFACE tables don't match that scenario. I am all for getting at the truth here and I am not exactly sure what it is. I do know that Tom and Jonathan usually run a lot of tests and provide performance data to substantiate there findings. I wouldn't mind seeing some based on the INTERFACE tables you speak of. Also what good is releasing space if it is just going to be grabbed again the next time the INTERFACE table is used?

Ethan Post
(972) 577-6552
perotdba (AIM), epost1 (Yahoo)

-----Original Message-----
Sent: Tuesday, August 06, 2002 2:34 PM
To: Multiple recipients of list ORACLE-L

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

> also send the HELP command for other information (like subscribing).
>

--
__________________________________________________________
Sign-up for your own FREE Personalized E-mail at Mail.com
http://www.mail.com/?sr=signup

Get 4 DVDs for $.49 cents! plus shipping & processing. Click to join.
http://adfarm.mediaplex.com/ad/ck/990-1736-3566-59

--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Rajesh Dayal
   INET: rdayal73_at_techie.com


--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Post, Ethan
   INET: Ethan.Post_at_ps.net

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: ListGuru_at_fatcity.com (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).




_________________________________________________________________
Chat with friends online, try MSN Messenger: http://messenger.msn.com

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Mohammad Rafiq
  INET: rafiq9857_at_hotmail.com

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: ListGuru_at_fatcity.com (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).
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Post, Ethan
  INET: Ethan.Post_at_ps.net

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: ListGuru_at_fatcity.com (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).