Queries Referencing Tables Reorganized Using the DBMS_REDEFINITION Package have Changed Plans and Degraded in Performance.
(Doc ID 1966819.1)
Last updated on OCTOBER 30, 2019
Applies to:Oracle Database - Enterprise Edition - Version 188.8.131.52 and later
Oracle Database Cloud Schema 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
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.
- Some queries referencing tables reorganized using the DBMS_REDEFINITION package have changed plans and degraded in performance.
- The reorganized tables are missing histogram statistics that were present on the original table.
DBMS_REDEFINITION was used to reorganize one or more tables. Statistics were regathered on the intermediate table before finishing the reorganization, or were regathered on the redefined table immediately after the reorganization was complete.
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