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You want to take a complete database backup using RMAN. The backup should consist onlythe used blocks from your database. Which two statements are true about this backup operation？（） 
A: Backup compression should be enabled
B: Parallelism for the channel should be set to 2
C: All the files must be backed up as backup sets
D: The backup may be stored either on disk or on media with media manager

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出自：Oracle认证

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