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A federated database consists of several loosely integrated databases, where each database may contain hundreds of tables and thousands of columns, interrelated by complex foreign key relationships. In general, there exists a lot of semi-structured data elements outside the database represented by documents (files), created and updated by multiple users and programs. Documents have references to multiple databases and subsets of their tables and columns. Manually tracking which specific tables and columns are referred to by a document, accessed by a specific program or user is a daunting task.
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