oracle 9i 建立oracle 10g dblink

在oracle9i的机器的tnsnames.ora里配置10g的服务名为：
ora10g   =
    (DESCRIPTION   =
        (ADDRESS_LIST   =
            (ADDRESS   =   (PROTOCOL   =   TCP)(HOST   =   ip )(PORT   =   1522))
        )
        (CONNECT_DATA   =
            (SERVICE_NAME   =   ora10g)
            (SID   =   ora10g)
        )
    )
然后：
create   database   link   dblink_test    connect   to   username   identified   by   passwd   using   'ora10g ';