I can't answer your question, but was thinking about SAP DB. Since it's going to be [link|http://www.mysql.com/sapdb/|tied up with MySQL] it seems like a migration path that you might want to consider.
Replication tools for SAP DB are [link|http://www.sapdb.org/sap_db_tools.htm|here].
Herr Greg might have some thoughts about it as he seems to be a big SAP DB fan.
HTH. GL!
Cheers,
Scott.