plsql developer如何连接远程oracle数据库

在安装ORACLE的目录下 /oracle/product/10.2.0/db_1/NETWORK/ADMIN 有个tnsnames.ora 加入如下代码 

 数据库名= 

 (DESCRIPTION =

  (ADDRESS_LIST =

   (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.17 )(PORT = 1521)) 

 )

 (CONNECT_DATA =

  (SERVICE_NAME =数据库名)

  ) 

 )