单项选择题
A.when multiple databases are to be registered with the listener
B.when DBAs need to connect remotely to start up the database instance
C.when users need to connect the database instance using the host naming method
D.when the database instance that is to be registered with the listener is configured in shared server mode
多项选择题 View the Exhibit and examine the output. Which two statements are true regarding the LISTENER2 listener（）
单项选择题 Your database is open and the LISTENER listener is running. The new DBA of the system stops thelistener by using the command： LSNRCTL> STOP What happens to the sessions that are presently connected to the database instance（）
单项选择题 What could be the reason for this（）