The following is the ORA-00218 error message, you can learn the cause and solution of the Oralce error.
ORA-00218 block size string of controlfile does not match DB_BLOCK_SIZE (string)
Cause: 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.
Solution: Restore a good copy of the control file.
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