Re: Fixing Performance issue with less selective columns

  • From: Mladen Gogala <gogala.mladen@xxxxxxxxx>
  • To: oracle-l@xxxxxxxxxxxxx
  • Date: Wed, 25 Aug 2021 23:03:58 -0400

Well, if the database is an OLTP database, I would also consider creating a single table hash cluster. True, that would probably require quite a large reorganization of the table but only the OP can decide whether it's worth the effort or not. After all, such decisions are eventually made on the cost/benefit basis.

On 8/25/21 2:14 PM, Lothar Flatz wrote:

This scenario cries for bitmap indexes.
Bitmap Indexes can deal with "not equal" as well as "is null".

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Mladen Gogala
Database Consultant
Tel: (347) 321-1217
https://dbwhisperer.wordpress.com

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