Oracle Solution for Error ora-16642

ORA-16642: DB_UNIQUE_NAME mismatch

What triggered the Error:

The expected DB_UNIQUE_NAME value did not match the actual DB_UNIQUE_NAME value for the database that the broker contacted using the connect identifier that was associated with that database.

What should we do to fix it:

Verify that the connect identifier correctly connects to the intended database. Verify that the name of the database the broker expects to find by that connect identifier matches the actual DB_UNIQUE_NAME for that database.