@ Amerjit : Oracle 10 g will not support the AIX 7.1 ,so this procedure will not work.
@ RB : Why to do the Oracle upgrade to 11 G , why not directly export and while import only install the 12c in target system .Please correct me if i am wrong.
and do you have any SAP note number to refer for splitting the tables and also making use of parallel export/import.
Thanks
Rableen