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You executed the following command in the lsnrctl utility to stop the listener： lsnrctl> STOP L1  What is the effect of this command if L1 is the only listener configured for your database？（）
A:It terminates all user sessions.
B:It prevents users from logging in to the database remotely.
C:It halts the server until all user transactions are completed.
D:The server hangs， so users will receive an error asking them to login again.
E:Connected users would get an error with the message "End of communication channel".

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出自：Oracle认证

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