It sounds like that old LRPDism about RedBrick. :-(
I can't offer any specific knowledge. I assume you know about Oracle's Migration Workbench: http://www.oracle.co...kbench/index.html
The tool apparently knows about MySQL 3, 4 and 5.0:
http://www.oracle.co...ntofdirection.htm
Good luck!
Cheers,
Scott.