Oracle Error Message
ORA-19882: datafile string checkpoint string is ahead of space bitmap datafile string checkpoint string
Reason for the Error
When checkpointing the datafile containing the space bitmaps for the datafile being backed up in order to use Unused Block Optimization, the checkpoint of the datafile containing the space bitmaps did not advance.
Solution
Examine the trace and alert files for possible causes. Fix underlying problem to use Unused Block Optimization for datafile’s backup.