ORA-12504: TNS: 监听程序在 CONNECT_DATA 中未获得 SERVICE_NAME
oracle是11g，我在服务器上部署web程序直接连本机数据库，

tnsnames.ora文件
# tnsnames.ora Network Configuration File: D:\app\Administrator\product\11.1.0\db_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.

LISTENERBOB =
  (DESCRIPTION =
  (ADDRESS_LIST =
  (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.6.90)(PORT = 1521))
  )
  (CONNECT_DATA =
  (Service_Name = orcl)
  (SID = orcl) 
  )
  )
listener.ora文件内容
# listener.ora Network Configuration File: D:\app\Administrator\product\11.1.0\db_1\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.

LISTENERIT =
  (DESCRIPTION =
  (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.6.90)(PORT = 1521))
  )

SID_LIST_LISTENERIT =
  (SID_LIST =
  (SID_DESC =
  (GLOBAL_DBNAME = Oracle8)
  (ORACLE_HOME = D:\app\Administrator\product\11.1.0\db_1)
  (SID_NAME = ORCL)
  )
  )


一直报 “ORA-12504: TNS: 监听程序在 CONNECT_DATA 中未获得 SERVICE_NAME” 错误，以前曾经可以过，好久没动，居然不行了，于是我把监听和net服务全部重新配置了，


------解决方案--------------------
LISTENERBOB = 
(DESCRIPTION = 
(ADDRESS_LIST = 
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.6.90)(PORT = 1521)) 
) 
(CONNECT_DATA = 
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
) 
) 

------解决方案--------------------

SQL code

listener.ora文件内容改成如下:

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = D:\app\Administrator\product\11.1.0\db_1)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = ORCL)
      (ORACLE_HOME = D:\app\Administrator\product\11.1.0\db_1)
      (SID_NAME = ORCL)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
    )
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.6.90)(PORT = 1521))
    )
  )


--tnsnames.ora内容:
LISTENERBOB =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.6.90)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = ORCL)
    )
  )

------解决方案--------------------

先在system用户下查一下你的数据库实例名是否为“orcl”？：
  
select   value$   from   sys.props$   where   name='GLOBAL_DB_NAME';

------解决方案--------------------
show parameter service_names
另外看看INIT.ORA文件里有service_names这一项吗？它的值是否等于ORCL
当然前提必须如楼上所说的你要确认名为ORCL的数据库实例存在