OR-Expansion in 19c Causes Slower Executions Plans than in Previous Versions
(Doc ID 2747498.1)
Last updated on MAY 21, 2021
Applies to:Oracle Database - Enterprise Edition - Version 22.214.171.124 to 126.96.36.199.0 [Release 12.2 to 19]
Information in this document applies to any platform.
You upgraded from 11.2 or 12.1, and queries involving OR-expansion are slower in 19c. The good plan likely contained a CONCATENATION operation, whereas the new plan does not.
Upgrade from 11.2 or 12.1 to 19c.
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