单选题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.
单选题
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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