How to fix the error ORA-00209: control file blocksize mismatch, check alert log for more info?

In this post, you’ll learn more about the Oracle ErrorORA-00209: control file blocksize mismatch, check alert log for more info with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

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

Reason for the Error ORA-00209: 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.

How to fix the Error ORA-00209: control file blocksize mismatch, check alert log for more info ?

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

Look at the alert log for more information.