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