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In Recovery Manager （RMAN）， you set the retention policy to NONE by executing the following command：  CONFIGURE RETENTION POLICY TO NONE;  What would be the impact of this setting？（）
A:The retention policy is cleared.
B:RMAN does not consider any backup as obsolete.
C:The retention policy is set to its default setting of redundancy 1.
D:The retention policy is set to its default setting of recovery window 7.

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出自：Oracle认证

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