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What does the SCN represent?（）
A:The system change number, which is a point in time relative to transactions within a given database. 
B:A number that represents time. Thus, at 1300 hours, the SCN is the same on all databases. 
C:The security change number, which represents the security code that is needed to access any database structure.
D:A conversion factor that converts internal database time to external clock time. 
E:UTC time in the database, providing a standardized way of tracking time in Oracle. 

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出自：Oracle认证

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