对比Oracle服务器地址，端口号，还有实例名（也就是服务名）。修改tnsnames.ora  在Oracle客户端的安装目录底下。

然后用sqlplus [用户名]/[密码]@[服务命名]

服务命名就是NetManager里面服务命名能看到的名称也就是服务命名，服务命名其实就是数据库实例的别名

以上命令就能正常连接数据库了

references:

https://blog.csdn.net/hhw999/article/details/52516685

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