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Changing platforms requires the database be re-built and / or the data moved using one of the following methods:
1.Export / Import.
3.RMAN Convert Database functions.
5.Create Table As Select.
6.Dataguard Heterogeneous Primary and Physical Standbys.
7.Oracle Golden Gate.
But each way has its own limitation usually you have to know that "RMAN Convert Database only works if both source and destination belong to the same ENDIAN format."
so in your case you can use "Transportable Tablespaces"
You can Read the following
Also MOS Notes :
Migration of an Oracle Database Across OS Platforms [ID 733205.1]
Data Guard Support for Heterogeneous Primary and Physical Standbys in Same Data Guard Configuration [ID 413484.1]
*10g+: Transportable Tablespaces Across Different Platforms [ID 243304.1]*