OR-Expansion in 19c Causes Slower Executions Plans than in Previous Versions
(Doc ID 2747498.1)
Last updated on JULY 20, 2024
Applies to:
Oracle Database - Enterprise Edition - Version 12.2.0.1 to 19.14.0.0.0 [Release 12.2 to 19]Information in this document applies to any platform.
Symptoms
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.
Changes
Upgrade from 11.2 or 12.1 to 19c.
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |