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Every Sunday the Unix system administrator has a job that executes a full backup of the entire Unix system your database is on. Is this backup usable for backup and recovery of your database？（）  
A: Yes， if the database is in ARCHIVELOG mode
B: Yes， if the database is in NOARCHIVELOG mode
C: No， the backup is not usable in any way
D: Only if the ENABLE_ONLINE_BACKUP parameter is set to TRUE

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出自：Oracle认证

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