ORA-12514 TNS 监听程序当前无法识别连接描述符中请求服务 的解决方法

找到listener.ora文件，修改如下

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = E:Oracle10g)
      (PROGRAM = extproc)
    )
   (SID_DESC =
    (GLOBAL_DBNAME = ORCL)
    (ORACLE_HOME = E:Oracle10g)
    (SID_NAME = ORCL)
    )
 )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = onest)(PORT = 1521))
    )
  )

标红的为我添加的部分，ORCL为监听的实例名。