错误的意思是listener 不知道连接解析器中的请求服务，这里要说静态监听和动态监听了
动态注册是在instance启动的时候pmon进程根据init.ora中的instance_name,service_names两个参数将实例和服务动态注册到listener中。
静态注册就是实例启动时读取listener.ora文件的配置，将实例和服务注册到监听程序。无论何时启动一个数据库，默认地都有两条信息注册到监听器中：数据库服务器对应的实例和服务。
搭建dataguard过程中，先启动的数据库，没有在listener.ora 中设置静态监听。重新设置后。
# listener.ora network configuration file: /opt/oracle/10.2.0/orcl/network/admin/listener.ora
# generated by oracle configuration tools.
sid_list_listener =
(sid_list =
(sid_desc =
(sid_name = orclpdg)
(oracle_home = /opt/oracle/10.2.0/orcl)
)
–增加内容 begin
(sid_desc =
(sid_name = plsextproc)
(oracle_home = /opt/oracle/10.2.0/orcl)
(program = extproc)
)
)
–增加内容 end
listener =
(description_list =
(description =
(address = (protocol = ipc)(key = extproc1))
(address = (protocol = tcp)(host = 10.250.7.230 )(port = 1521))
)
)
oracle@yangdb2:/opt/oracle/10.2.0/orcl/network/admin>lsnrctl
lsnrctl> status
lsnrctl> reload
lsnrctl> status