ORA-12514

 若继续报错ORA_12514:TNS:listener does not currently know of service requested in connect descriptor,在listener.ora添加红色字体部分：

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = E:\app\product\11.2.0\dbhome_1)
      (PROGRAM = extproc)
      (ENVS = "EXTPROC_DLLS=ONLY:E:\app\product\11.2.0\dbhome_1\bin\oraclr11.dll")
    )
    (SID_DESC =
      (GLOBAL_DBNAME = orcl)
      (ORACLE_HOME = E:\app\product\11.2.0\dbhome_1)
      (SID_NAME = orcl)
    )
  )

 重启监听，可正常连接