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Which two statements about Flashback Query are true？（）
A:It is generated by using the redo log files. 
B:It helps in row-level recovery from user errors.
C:It can be performed to recover ALTER TABLE statements 
D:It fails when undo data pertaining to the transaction is overwritten.
E:The database has to be opened with the resetlogs option after performing Flashback Query.

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出自：Oracle认证

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