SQL Plan Changes Due To Optimizer Statistics Is Restored Unexpectedly. (Doc ID 3003249.1)

Last updated on FEBRUARY 27, 2024

Applies to:

Oracle Database - Enterprise Edition - Version 12.2.0.1 and later
Information in this document applies to any platform.

After database server release upgrades from 11g to 12c, a SQL's execution plan change causes SQL performance downgrade.

By comparing the CBO trace in 11g and 12c, find that the selectivity of index is high, full table scan is chosen.

11g:

None.

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In this Document

Symptoms

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