RDBPROD: Dynamic Optimizer Uses Wrong Background Index Resulting in Bad Performance (Doc ID 1480189.1)

Last updated on AUGUST 12, 2016

Applies to:

Oracle Rdb Server on OpenVMS - Version 7.1 to 7.2.5.4 [Release 7.1 to 7.2]
HP OpenVMS Itanium
HP OpenVMS Alpha

Symptoms

An index has been recreated. Prior to this, the performance was good and the optimizer strategy looked like:

 
Index INDEX_222 is now chosen as the second background index, which resulted in 7+580010 fetches instead of 5+3 fetches.

Changes

An index has been recreated.

Cause

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