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You want to use the Flashback Transaction Query feature to identify all the changes made to your database within a specific time period. What is a prerequisite for using the Flashback Transaction Query feature？（）
A: You must use automatic undo management in the database.
B: You must configure OMF in your database.
C: You must configure ASM for storing the datafiles.
D: You must multiplex the online redo log file.

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出自：Oracle认证

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