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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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