An "INDEX RANGE SCAN" is Performed on a Column Containing Unique Values when an "INDEX UNIQUE SCAN" is Expected.
(Doc ID 1962993.1)
Last updated on NOVEMBER 06, 2019
Applies to:Oracle Database - Enterprise Edition - Version 126.96.36.199 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
- An "INDEX RANGE SCAN" is performed on a column containing unique values when an "INDEX UNIQUE SCAN" is expected.
- This may result in a suboptimal execution plan. In this example a unique scan is expected on the TMP_SERVICEID_IDX index:
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