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You disabled the Flashback Database feature by using the following command：  SQL> ALTER DATABASE FLASHBACK OFF；  What would be the effect of this command on the existing flashback logs？（）
A: Flashback logs are not deleted.
B: Flashback logs are deleted automatically.
C: Flashback logs are deleted only if you are using Recovery Manager （RMAN）
D: Flashback logs are deleted only if you are using Oracle Manager Files （OFM）
E: Flashback logs are deleted only if you are using Automatic Storage Management （ASM）

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出自：Oracle认证

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