Huge undotbs during insert

Hi,

I have to duplicate a big table
so I did:

insert /*+ append nologging */
into table2
select * from table1;

The operation failed due to
the filling of the UNDOTBS
Is it normal to have up to 4 times ( or more ) the size of table1 in undotbs ?

How can I speed up this operation ?
I tried parallel :

alter session enable parallel dml;
insert /*+ append nologging parallel (table1,4) */ into table2
select * from table1;

but no parallel processing occurred ...

Thanks for your help ...

Oracle 9.2.0.1
HP-UX 11.0 Received on Wed May 25 2005 - 14:25:36 CDT