RE: re Rebuilding Indexes in Oracle Apps -- was RE: RE: Separate

Fyi, Oracle updated note 182699.1 last Friday. The inaccurate statements about "index fragmentation" have been removed.

Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com

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-----Original Message-----
Richard Foote
Sent: Friday, October 17, 2003 6:29 AM
To: Multiple recipients of list ORACLE-L Separate

Hi Hemant,

One word perfectly describes the Metalink article you highlighted:

Crap ;)

A nice example of how Oracle Corp is the greatest myth generator of them
all !! It's all rather sad and embarressing isn't.

Thanks for the headsup. Anyone in a position to get the note removed ?

Cheers

Richard

>Quoting Metalink Note 182699.1 bde_rebuild.sql Validates and Rebuilds
Fragmentated Indexes (8.0->9.0)
>
>Index fragmentation occurs when a key value changes, and the index row
is
>deleted from one place (Leaf Block) and inserted into another.
>
> Deleted Leaf Rows are not reused. Therefore indexes whose columns are
 >subject to value change must be rebuilt periodically since they become naturally fragmentated.
>

 >An index is considered to be 'fragmentated' when more than 20% of its Leaf
Rows space is
>empty because of the implicit deletes caused by indexed columns value
changes.
>

 >Fragmentated indexes degrade the performance of index range scan operations.

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Author: Cary Millsap
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