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)
    )
  )