解决Oracle报错：ORA-12560: TNS: 协议适配器错误

连接Oracle数据库时报一下错误

执行请求的操作时遇到错误:ORA-12560: TNS: 协议适配器错误
12560. 00000 -  "TNS:protocol adapter error"
*Cause:    A generic protocol adapter error occurred.
*Action:   Check addresses used for proper protocol specification. Beforereporting this error, look at the error stack and check for lower leveltransport errors. For further details, turn on tracing and reexecute theoperation. Turn off tracing when the operation is complete.
供应商代码 12560

解决方法：打开服务
运行->服务
如下图：

发现如下有些Oracle服务并未启动，右击启动，再次尝试，成功。