RE: Rebuild Indexes

From: John Kanagaraj <john.kanagaraj_at_hds.com>
Date: Wed, 18 Feb 2004 08:59:58 -0800
Message-ID: <35CFD500D7BDCE43B9030BBA5979DC181D931A@ussccem13.hds.com>

Naveen,

I believe the problem is not with a monotonically increasing index (which should NOT be rebuilt as it is of no use) - rather it is with a monotonically increasing index that is also being _deleted. This is typical of indexes on FIFO-type tables such as the FND_CONCURRENT_REQUESTS in Apps (any version). In the latter case, you should perform a 'one-time' index rebuild of such monotonically-increasing, followed by regular COALESCE of the indexes to 'reclaim' 'lost' space. Jonathan/Richard Foote might have something to add on this....

John Kanagaraj <><
DB Soft Inc
Phone: 408-970-7002 (W)

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>-----Original Message-----
>From: oracle-l-bounce_at_freelists.org
>[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Naveen,
>Nahata (IE10)
>Sent: Tuesday, February 17, 2004 11:24 PM
>To: oracle-l_at_freelists.org
>Subject: RE: Rebuild Indexes
>
>
>John,
>
>Would it be advisable to go for Index rebuilds in case of
>index based on
>monotonically increasing columns? As much as I understand (and
>I must admit,
>i don't know much about the internals of indexes), in case of
>such indexes
>the problem of 'leaf block split' should not happen.
>
>Regards
>Naveen
>
>>-----Original Message-----
>>From: John Kanagaraj [mailto:john.kanagaraj_at_hds.com]
>>Sent: Wednesday, February 18, 2004 12:30 PM
>>To: 'oracle-l_at_freelists.org'
>>Subject: RE: Rebuild Indexes
>>
>>
>>Vidya,
>>
>>If you are collecting (and storing) STATSPACK data, you might want to
>>baseline V$SYSSTAT values and look for spurts in 'leaf node
>>splits' after
>>rebuilds....
>>
>>John Kanagaraj <><
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Received on Wed Feb 18 2004 - 10:59:58 CST