The following is the ORA-19648 error message, you can learn the cause and solution of the Oracle database error.
ORA-19648 datafile string: incremental-start SCN equals checkpoint SCN
Cause: The incremental-start SCN which was specified when starting an incremental datafile backup is equal to the datafile’s checkpoint SCN. Since an incremental backup can only be applied to a datafile whose checkpoint SCN is between the backup set incremental-start SCN (inclusive) and the backup set checkpoint SCN (exclusive), there is no datafile that this backup set could ever be applied to.
Solution: Specify a smaller incremental-start SCN.
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