V$BACKUP

V$BACKUP displays the backup status of all online datafiles.

Column	Datatype	Description
`FILE#`	`NUMBER`	File identifier
`STATUS`	`VARCHAR2(18)`	File status: `NOT ACTIVE`, `ACTIVE` (backup in progress), `OFFLINE NORMAL`, or description of an error. `NOT ACTIVE` indicates that the file is not currently in backup mode (that is, an `ALTER TABLESPACE ... BEGIN BACKUP` or `ALTER DATABASE BEGIN BACKUP` statement has not been issued), whereas `ACTIVE` indicates that the file is currently in backup mode.
`CHANGE#`	`NUMBER`	System change number when backup started
`TIME`	`DATE`	Time the backup started