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You perform a backup using the following BACKUP command：   RMAN> BACKUP AS COMPRESSED BACKUPSET DATABASE；   Which statement is true of this command？（）  
A: A different procedure is required to restore a database from compressed backups
B: The AS COMPRESSED clause of the BACKUP command provided by RMAN is used to create compressed  backup sets and image copies.
C: Using this command to create backups minimizes the bandwidth consumed
D: Using this command to create backups improves the performance of the backup process

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出自：Oracle认证

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