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.

Action: Restore a good copy of the control file.

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