Cause
The block size in the control file header does not match the size specified in the DB_BLOCK_SIZE parameter.
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.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
https://community.oracle.com/message/1197036
https://community.oracle.com/message/3281436
https://community.oracle.com/message/1459395
https://community.oracle.com/message/607983
https://community.oracle.com/message/9173702
https://community.oracle.com/message/1264867
https://community.oracle.com/message/1962013
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