ORA-12514 TNS:LISTENER DOES NOT CURRENTLY KNOW OF SERVICE REQUESTED IN CONNE
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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