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You are the Database Administrator （DBA） of your company. You execute the following statement on an Oracle 10g instance：   SQL> ALTER SYSTEM SWITCH LOGFILE；   Which two tasks are performed when the statement is executed？ （）
A: The DBWn process writes to the datafile.
B: Changes in the background process are recorded.
C: The log file is updated with the current SCN number.
D: The System Change Number （SCN） is recorded in the control file.
E: The changes to the listener configuration in the listener.ora file are recorded.

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出自：Oracle认证

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