I think you may try DB2 Relational Connect which helps integrate information by allowing a collection of databases to be viewed and manipulated as if they were a single resource. It makes data source access completely transparent to the calling application.
I have never used it myself, but it sounds like.. it may serve ur purpose. You need to do a little bit of R&D in that area.
IBM DB2 Relational Connect works in conjunction with DB2 Universal Database Version 7 EE or EEE and provides native read access to Informix IDS, Oracle, Sybase, and Microsoft SQL Server databases. You can use it to formulate queries on heterogeneous data in a federated system, or you can use it with the Data Warehouse Center.
It can Query and retrieve information from:
-Informix data sources
-Oracle, V7, V8, V9i data sources
-Sybase, V10, V11, and V12 (Microsoft® Windows® NT and AIX), data sources
-Microsoft SQL Server V6.5, V7 and 2000 data sources on Windows NT
Visit for details:
http://www-306.ibm.com/software/data/db2/relconnect/