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OCR: THE FEDERATED DATABASE MODEL DB2 CA-IDMS Metaschema Manages: Mainframe (MVS, VMS) Application A 1. Business quies Oracle Sybase 2. Commits 3. Recovery Minicomputers (VAX, Unix) 4. Backups Application B 5. Concurrency FoxPro Paradox PC networks (Windows, OS/2) Figure 3. The federated database architecture is similar to other DBMS architectures but is generally the most effective model for heterogeneous databases.