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042题求解,该怎么解决

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042题求解
Your database is open and users are connected using the LISTENER listener. The new DBA of the system stops the listener by using the following command:
LSNRCTL>STOP
What would happen to the sessions that are presently connected to the database instance?
A) The sessions are able to perform only queries.
B) The sessions are not affected and continue to function normally.
C) The active transactions are rolled back and the sessions get terminated.
D) The sessions are not allowed to perform any operations till the listener is started.

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选择B,已经建立的连接不受影响。
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SQL code
B) The sessions are not affected and continue to function normally.
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Your database is open and users are connected using the LISTENER listener. The new DBA of the system stops the listener by using the following command:
LSNRCTL>STOP
What would happen to the sessions that are presently connected to the database instance?
A) The sessions are able to perform only queries.
B) The sessions are not affected and continue to function normally.
C) The active transactions are rolled back and the sessions get terminated.
D) The sessions are not allowed to perform any operations till the listener is started.
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