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You executed the following query in your database：  FROM V$FLASHBACK_DATABASE_LOG;  What would you determine from the output？（）
A:the time when the last flashback operation in your database was performed
B:the time when the first flashback operation in your database was performed
C:a list of flashback operations performed in your database using SCN and time
D:the approximate time and the lowest system change number （SCN） to which you can flash back your database

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出自：Oracle认证

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