unsupported optimization of Oracle binary, check alert log for more info

ORACLE binary has been optimized with unsupported options or a required option has not been used.

How to Solve :

Check the documentation for a list of supported and required flags for the optimizing utility that you used to optimize ORACLE. Shutdown the instance, optimize ORACLE again with supported combination of options and restart the instance.

control file not mounted by first instance, check alert log for more info

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.

How to Solve :

Find and install the correct control file.

error in identifying control file, check alert log for more info

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

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

control file blocksize mismatch, check alert log for more info

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

Look at the alert log for more information.