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Which two statements are true about encrypting RMAN backup？（）
A: The transparent encryption of backups uses the encryption wallet
B: The database uses the same encryption key for every encrypted backup
C: The password encryption of backups only uses the password while creating and restoring backup
D: If transparent encryption is configured， you cannot use the SET ENCRYPTION BY PASSWORD  command to make password-protected backups

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出自：Oracle认证

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