PL/SQL ORA-12514 TNS 监听程序当前无法识别连接描述符中请求服务

方法1：

通过Net Configuration Assistant  重新进行“监听程序配置”。

方法2：

在Network/admin目录下找到listener.ora 

增加红色字体部分内容，重启服务器。

SID_LIST_LISTENER =

  (SID_LIST =

    (SID_DESC =

      (SID_NAME = PLSExtProc)

      (ORACLE_HOME = D:\app\product\11.2.0\dbhome_1)

      (PROGRAM = extproc)

    )
   (SID_DESC =

    (GLOBAL_DBNAME = ORCL)

    (ORACLE_HOME = D:\app\product\11.2.0\dbhome_1)

    (SID_NAME = ORCL)

    )

 )

LISTENER =

  (DESCRIPTION_LIST =

    (DESCRIPTION =

      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))

      (ADDRESS = (PROTOCOL = TCP)(HOST = onest)(PORT = 1521))

    )

  )