How to migrate Ingres to Oracle?

Hi,
I'm going to migrate an Ingres 6.4.05 which is now running in
DNX 6000 machine to an ORACLE database, and if possible into an
oracle8i. I understand that Oracle Workbench doesnt support this
migration procedure. So, is there any other tools or third-party
product which can help me achieve this?
Any feedbacks and suggestions are greatly appreciated. Thanks.

Hi,
There are some toolkits (unsupported now) that may help you with
your conversion.
http://otn.oracle.com/tech/migration/toolkits/content.html
Also, check out the following site for partners that may also be
able to assist you
http://otn.oracle.com/tech/migration/mti/content.html

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