oracle数据库在客户端建立dblink语法

create database link dblink_name connect to user_name identified by user_psw using 
'(DESCRIPTION = 
(ADDRESS_LIST = 
(ADDRESS = (PROTOCOL = TCP)(HOST = xxx.xx.xxx.xx)(PORT = 1521)) 
) 
(CONNECT_DATA = 
(SERVICE_NAME = orcl) 
) 
)'