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Your database is in NOARCHIVELOG mode. You start to do a backup, but your users complain that
they dont want you to shut down the database to perform the backup. What options are available to you?
A. Put the database in hot backup mode and perform an online backup, including backing up the archived
redo logs.
B. Just back up the database datafiles without shutting down the database.
C. You will have to wait until you can shut down the database to perform the backup.
D. Mark each datafile as backup in progress, back them up individually, and then mark them as backup
not in progress. No archived redo logs will need to be backed up.
E. Only back up the datafiles that the user will not be touching. Once the user has finished what they were
doing, you can shut down the database and back up the datafiles the user changed during the course of
the remaining backup

　　You will have to wait until you can shut down the database since it's in NOARCHIVELOG mode.No other option will give you a backup that is recoverable.

注:非归档模式只能冷备。