像如下的SQL是不能执行的。（ipop_topic表有一个CLOB的字段）
insert into ipop_topic
select * from ipop_topic@prod.us.oracle.com where application_id=1000
但是，我们可以借助全局临时表，先把数据复制到临时表，再从临时表转移到你的目的表。
create global temporary table ipop_topic_temp
as select * from ipop_topic@prod.us.oracle.com where rownum=1
insert into ipop_topic_temp
select * from ipop_topic@prod.us.oracle.com where application_id=1000
insert into ipop_topic
select * from ipop_topic_temp
commit