How to fix the Oracle error ORA-19955: only one open thread is allowed to change the DBID?

In this post, you’ll learn more about the Oracle ErrorORA-19955: only one open thread is allowed to change the DBID with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

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

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

The 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.

How to fix the Error ORA-19955: only one open thread is allowed to change the DBID ?

You can fix this error in Oracle by following the below steps

Ensure 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.