Unexpired Segments Found In Unused UNDO Tablespace
(Doc ID 2082634.1)
Last updated on MARCH 05, 2019
Applies to:Oracle Database - Enterprise Edition - Version 10.2.0.1 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.
Querying dba_undo_extents view shows unexpired extents in an undo tablespace that is not the current undo tablespace of the database.
This is an old undo tablespace with no transactions attached to it and database has switched to a new undo tablespace.
Below is a sample set of steps to simulate this behaviour:
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