tnsnames.ora配置注意（连接新的数据库）

文件地址D:\app\think\product\11.2.0\instantclient_11_2\network\admin\tnsnames.ora
# tnsnames.ora Network Configuration File: D:\app\think\product\11.2.0\client_1\NETWORK\ADMIN\tnsnames.ora
# Generated by Oracle configuration tools.

SMSPLATFORM =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.250)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = smsplatform)
    )
  )

WX_HOFFICE =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.250)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = wx_hoffice)
    )
  )

WXPT =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.250)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = wxpt)
    )
  )

如上的tnsnames.ora配置信息显示有三个数据库连接。

需要注意的情况：
（1）如果tnsnames中的service_name配置错误，配置成了instance_name了，这个时候会发生tnsping能通，但是 sqlplus连接不上的奇怪情况。报错ORA-12514: TNS:listener could not resolve SERVICE_NAME given in connect descriptor。这个时候查错的时候，需要检查对应的service_name。

（2）有空格也会出错，需要删除空格

如：

空格dev_db =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 172.168.10.5)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SID = ora10)
    )
  )