http://blog.csdn.net/yusiyuuestc/article/details/22742589
https://www.cnblogs.com/lijiaman/p/6160087.html
http://blog.csdn.net/dongyewolong/article/details/8924763
http://blog.itpub.net/2317695/viewspace-761795/
严重: 监听程序未启动或数据库服务未注册到该监听程序。启动该监听程序并注册数据库服 务, 然后重新运行 EM Configuration Assistant。
http://blog.csdn.net/shuzhongxiao/article/details/7684629