ORA-00218

Error: ORA-00218: block size string of controlfile does not match DB_BLOCK_SIZE (string)

Causa: The block size as stored in the control file header is different from the value of the initialization parameter DB_BLOCK_SIZE. This might be due to an incorrect setting of DB_BLOCK_SIZE, or else might indicate that the control file has either been corrupted or belongs to a different database.

Acción: Restore a good copy of the control file.