RE: bitmapped indexes

The paper says performance is good but concurrency is a problem:

"Depending on the cardinality of data, this may mean locking several thousand rows at once. For this
reason, it may not be a good idea to use bitmap indexes for environments where high levels of concurrent updates to the base data are required."

Regards,

Waleed

-----Original Message-----
Sent: Tuesday, January 14, 2003 5:49 AM
To: Multiple recipients of list ORACLE-L

Hi !
I don't remember where I got the paper, but I am attaching it.

Cheers.

-----Original Message-----
Sent: ? 13 ????? 2003 19:40
To: ORACLE-L_at_fatcity.com; Andrey Bronfin

Andrey,

Perhaps you could tell us what paper, and where to obtain it.

>From the context, it sounds like a reference to physical modifications rather than DML.

Jared

On Monday 13 January 2003 07:54, Andrey Bronfin wrote:
> Dear gurus !
> A ( maybe ) stupid question : I always thought that bitmapped indexes
> are bad for tables that undergo many DMLs agains them. Today i have
> came across an Oracle white paper, which says "modifications on tables
> with bitmap indexes can be done a lot faster than modifications with
> B-tree indexes.". Can you please sched some light on the matter ?
> Thanks a lot.
> Andrey,.

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Author: Khedr, Waleed
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