oracle database backup

Is there any indication that i get when i took complete online backup in Oracle 8 .i.e
the completion of the backup of all tablespaces is completion of entire o-8 database?
or any special way to find all are backed up?
online is it regarding to time or for next oracle arch
sequence file?

If you are using RMAN, there are several LIST and REPORT commands that will tell you this information.