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Which statements are true regarding SecureFile LOBs？（） 
A: The amount of undo retained is user controlled.
B: SecureFile LOBs can be used only for nonpartitioned tables.
C: Fragmentation is minimized by using variable-sized chunks dynamically.
D: SecureFile encryption allows for random reads and writes of the encrypted data.
E: It automatically detects duplicate LOB data and conserves space by storing only one copy.

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出自：Oracle认证

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