The following is the ORA-19660 error message, you can learn the cause and solution of the Oracle database error.
ORA-19660 some files in the backup set could not be verified
Cause: A restore conversation was made to verify all the files in a backup set, and the files which were printed in messages 19661 or 19662 could not be verified because corrupt blocks for those files were found in the backup set.
Solution: Unless the damage to the backup set can be repaired, the indicated files cannot be restored from this backup set.
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