OCP-1Z0-052-V8.02-130题

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130. Which two statements are true regarding listeners? (Choose two.)

A.Listeners use only the TCP/IP protocol.

B.Multiple listener processes can run simultaneously on a host.

C.Multiple database instances can be registered with a single listener.

D.The listener-related errors can be traced only at the administrative level.

E.Only one database instance can be registered with a single listener at any time.

Answer: BC

答案解析：

参考：http://blog.csdn.net/rlhua/article/details/12612249

A,监听只能视同TCP/IP协议，错误，还可以使用IPC协议，Internal Process Communication（内部进程通信，IPC）

B,多个监听可以同时在一台主机上运行，正确。

C,多个数据库可以被注册到同一个监听，正确。

D,相关的监听错误只能在管理级别上追溯,错误，还可以在user或者support级别上追溯。

LSNRCTL> help trace

trace OFF | USER | ADMIN | SUPPORT [<listener_name>] : set tracing to the specified level

E,错误，参考B选项