Oracle中tnsping命令解析
Oracle Net 工具（命令）tnsping，是一个OSI会话层的工具，它用来：验证名字解析（name resolution，是oracle自己的网络服务名）
Oracle Net 工具（命令）tnsping，是一个OSI会话层的工具，它用来：
1）验证名字解析（name resolution，，是oracle自己的网络服务名）
2）远程的listener是否启动
1.远程tnsping
2.关闭监听
3.启动监听，重新验证
总结：
1.tnsping 命令可以检查tcp协议是否已同，俗称我们说的网络通不通
2.tnsping命令监听服务器上的监听是否已开启
3.tnsping命令不检测服务器上的监听的服务名，所以tnsping通，不代表就能连通。
推荐阅读：
不同用户下使用tnsping+客户端服务名，结果不同
Oracle数据库中listener.ora sqlnet.ora tnsnames.ora的区别
Oracle RAC 下非缺省端口监听配置(listener.ora tnsnames.ora)
Oracle RAC 监听配置 (listener.ora tnsnames.ora)
Oracle: listener.ora 、sqlnet.ora 、tnsnames.ora的配置及例子
Oracle本地命名服务tnsnames.ora配置
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