How can I copy a database to a new machine using RMAN?

Hello All,

We have to move a database to a new machine. We are using Oracle 10.2.0.4 on 
both machines.  Machine1  (source) is AIX.  Machine 2 (target) is Solaris. Both 
are big-endian  I am trying to do it using RMAN.  As a proof of concept I am 
trying to copy test database (DB1) to a second machine.  The trouble is that 
machine2
already has a DB (Test_DB).  I have made a full hot backup of DB1 and copied 
the backupset files to Machine2.  On Machine2 I have set the ORACLE_SID=DB1.  
Now my instructions say I should issue

RUN
{
allocate auxiliary channel c1 DEVICE TYPE disk;
DUPLICATE TARGET DATABASE to test nofilenamecheck ;
}

However, I feel that I should be doing a RESTORE command, on Machine 2.  Also, 
I am afraid to proceed with any command because I don't want to trash DB2a 
which is already on Machine2.

Has anyone done this sort of thing?   Can you please advise me?

Thank you.
Claudia Zeiler

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