ORA-00220: control file not mounted by first instance, check alert log for more info

ORA-00220: control file not mounted by first instance, check alert log for more info

Cause: The specified control file has a different mount ID than the other control files that are being mounted. This means that the first instance to mount the database did not use this control file.

Action: Find and install the correct control file.

ORA-00209: control file blocksize mismatch, check alert log for more info

ORA-00209: control file blocksize mismatch, check alert log for more info

Cause: The block size in the control file header does not match the size specified in the DB_BLOCK_SIZE parameter.

Action: Look at the alert log for more information.

ORA-00205: error in identifying control file, check alert log for more info

ORA-00205: error in identifying control file, check alert log for more info

Cause: The system could not find a control file of the specified name and size.

Action: Check that ALL control files are online and that they are the same files that the system created at cold start time.