单选题

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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来源:www.examk.com

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