ORA-00238: operation would reuse a filename that is part of the database
What triggered the Error:
The filename supplied as a parameter to the ALTER DATABASE BACKUP CONTROLFILE command or to cfileSetSnapshotName matches the name of a file that is currently part of the database.What should we do to fix it:
Retry the operation with a different filename.
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Oracle Official Support Knowledge Center
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Or maybe those geeks at: StackOverflow Board