ORA-19955: only one open thread is allowed to change the DBID Cause: The oper...

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ORA-19955: only oneopen thread is allowed to change the DBID
Cause: The operation failed because there were active threadsin the database. The
most likely cause is that the database crashed the last time it was shut down.
Action: Ensurethat all threads are closed before retrying the operation. Start and
open the database to perform crash recovery, then shut down with the NORMAL
or IMMEDIATE options to close it cleanly. Finally, try running the utilityagain.