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You issue the following command：   RMAN>CONFIGURE BACKUP OPTIMIZATION ON；   What is the result of this command on your backups？（）
A: An incremental backup strategy will be used automatically.
B: Read-only datafiles will not be backed up as long as backups of those files already exist and those backups meet established retention criteria.
C: RMAN will configure itself for maximum performance at the cost of CPU.
D: RMAN will configure itself for minimal OS/CPU impact at the cost of time to back up the database.
E: RMAN will automatically compress backups.

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出自：Oracle认证

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