フリー問題

問題文

A production database has to be backed up without stopping the application that uses it. Which condition makes an online whole database backup possible?

選択肢

1. The database keeps a guaranteed restore point and the recovery manager then copies the data files during normal use since the flashback logs stand in for the archived logs.
2. The database runs in archive log mode and the recovery manager then copies the data files during normal use since the archived logs carry the changes needed for a consistent result.
3. The database stays in no archive log mode and the recovery manager then copies the data files during normal use since the control file records the change for later recovery.
4. The database sits in the mounted state and the recovery manager later copies the data files during normal use since the instance keeps the users away from them.