ORA12514: TNS: 监听程序当前无法识别连接描述符中请求的服务

服务器莫名其妙的报这个错，之前一直正常，从google获取解决方案，解决之，记录如下：

1. Open the ""<OracleHome>/network/admin/listener.ora" file in the host,and you will see:
    SID_LIST_LISTENER =
    (SID_LIST =
      (SID_DESC =
        (SID_NAME = PLSExtProc)
        (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)
        (PROGRAM = extproc)
      )
    )
   2. Add the following lines after the 7th line in the above
             (SID_DESC =
        (GLOBAL_DBNAME = ORACLE)
        (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)   
        (SID_NAME = ORACLE)
       )
   3. At last the content of the file become to the following section:
SID_LIST_LISTENER =
    (SID_LIST =
      (SID_DESC =
        (SID_NAME = PLSExtProc)
        (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)
        (PROGRAM = extproc)
      )
      (SID_DESC =
        (GLOBAL_DBNAME = ORACLE)
        (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)   
        (SID_NAME = ORACLE)
       )
    )
   4. Save the file and restart the TNSListener service in the host. That's OK!