DWH loading : Do you use 2 types of tablespaces ?

Oracle 9R2, 
Tablepsace LMT / extent uniform size

Hi gurus!
after loading my table with an ETL my my_big_table took  22Go.
after a "alter table big_table move " --> move in the same tablespace, it
decreased to 10 Go.
So, now I want to retrieve the unused space from my tablespace again but
reducing datafiles give me an ORA-03297 (files contains used data beyond
requested RESIZE value). 

I guess alter 'table my_big_table move tablespace an_other_tablespace' would
solve the problem so my questions are :
1. For a DWH , do you use to use 2 type of tablespace , one for the loading
operation and one for de definitive use.
2. Is there other solution avoid the use of two tablespaces ?

Thanks in advance !
Philippe

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