Oracle 9i 32bit to 64bit

Dear all,
I have a question about oracle 9i change from 32bit to 64bit:
We want to change our SAP server from 32bit to 64bit (LINUX). In this case, we also want change the SAP from 32bit to 64bit (but no SAP release changed), and oracle 9i from 32bit to 64bit. Is this possible? How to do it? How much time need based on your estimate?
Because the system can not shut down more than 12 hours, we intend to use a old oracle export for new system installation and use the redolog rollforward to the lastest status. The new system is running on 64bit (oracle and SAP), but the redolog is 32bit, is it OK?
Thanks
Michael

steps are
Verify there are no invalid objects.
Verify all components in the DB are Valid
Install Oracle 64bit
Copy the Database files from the 32bit machine, to the 64bit machine.
(Datafiles, Logfiles, Controlfiles, init.ora, tnsnames.ora, listener.ora, etc..)
Run all the post scripts
When this was all done, there should be zero invalid objects.
export/import. advantage being that the old database will remain usable in case the migration fails
Good Luck
Vinod

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jy**** wrote:
I've resolved this legendary issue recently.
You have to uninstall 10.2 but install Oracle 11g client 32bit & 64bit both <font face="tahoma,verdana,sans-serif" size="1" color="#000">version</font> and have to change registry little bit.
For some reason my colleague fixed that issue with some patches on Oracle 10g installation, but that doesn't work for me...
Please refer to the link for detail...
[http://knol.google.com/k/jeyong-park/accessing-oracle-data-source-from-64bit]
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OracleDisciple wrote:
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