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"INDEX RANGE SCAN DESCENDING" Not Used after Adding Column to Index (Doc ID 2752380.1)

Last updated on MARCH 31, 2021

Applies to:

Oracle Database - Enterprise Edition - Version 18.4.0.0.0 and later
Information in this document applies to any platform.

Symptoms

On 18.4.0.0.0 of Oracle an expected "INDEX RANGE SCAN DESCENDING" is not used.

Changes

A recent upgrade to 18.4 of Oracle and a new column(s) is added to an index.

After adding one column to index (see testcase.sql and uncomment it when create index) we see
INDEX RANGE SCAN IDX_DH_LCD
instead of
INDEX RANGE SCAN DESCENDING IDX_DH_LCD

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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