Oracle Solution for Error ora-19955

ORA-19955: only one open thread is allowed to change the DBID

What triggered the Error:

e operation failed because there were active threads in the database. The most likely cause is that the database crashed the last time it was shut down.

What should we do to fix it:

sure that 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 utility again.