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Before a Flashback Table operation，you execute the following command：   ALTER TABLE employees ENABLE ROW MOVEMENT；   Why would you need this to be executed？（）  
A: Because row IDs may change during the flashback operation
B: Because the object number changes after the flashback operation
C: Because the rows are retrieved from the recycle bin during the flashback operation
D: Because the table is moved forward and back to a temporary during the flashback opertion

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出自：Oracle认证

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