V$BACKUP_DATAFILE_SUMMARY

V$BACKUP_DATAFILE_SUMMARY provides summary information for a specific criteria set, based on a backup job, a time range applicable to jobs, or a specific datafile).

Column	Datatype	Description
`NUM_FILES_BACKED`	`NUMBER`	Number of files backed up for specified criteria
`NUM_DISTINCT_FILES_BACKED`	`NUMBER`	Number of distinct files backed up
`NUM_DISTINCT_TS_BACKED`	`NUMBER`	Number of distinct tablespaces backed up
`MIN_CHECKPOINT_CHANGE#`	`NUMBER`	Minimum checkpoint change number of the datafile for specified criteria
`MAX_CHECKPOINT_CHANGE#`	`NUMBER`	Maximum checkpoint change number of the datafile for specified criteria
`MIN_CHECKPOINT_TIME`	`DATE`	Minimum checkpoint time of the datafile for specified criteria
`MAX_CHECKPOINT_TIME`	`DATE`	Maximum checkpoint time of the datafile for specified criteria
`INPUT_BYTES`	`NUMBER`	Total input bytes of files read
`OUTPUT_BYTES`	`NUMBER`	Total output bytes written
`COMPRESSION_RATIO`	`NUMBER`	Compression ratio
`INPUT_BYTES_DISPLAY`	`VARCHAR2(4000)`	Displayable format for input bytes
`OUTPUT_BYTES_DISPLAY`	`VARCHAR2(4000)`	Displayable format for output bytes