（多选题）
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.
正确答案
答案解析
略
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