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IIRC, DB2 can be set up to “front end” Oracle.

Then, as you read/write DB objects, it reads them from Oracle (if they don’t exist in DB2 format), and writes them back in DB2 format.

So as you run along, it’s a non-disruptive way to convert your db.

Or if you want you can just go balls to the wall and do a db copy or re-org and all of it will get migrated to DB2.

I’ve worked around DB2 for more than two decades.
It is by far the most reliable, recoverable, and robust database system there is.