So, you would begin with creating three Connections -- the first to a table or view in SQL Server, the second to a table or view in Oracle, the third to your Domino database. Set up a replication activity that uses whichever DBMS has what you would consider the master data record (the top level data, like a company name and its unique ID). Next, setup a secondary replication activity that merges (i.e., updates only) data from the other database.
It's like building a puzzle. Patience and perseverance go a long way. Also, having a DBA that can help you with the data relationships will greatly help!
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