Object Discovery and Uniication in Federated Database Systems

A key challenge in sharing-oriented information management environments, such as networks of heterogeneous, autonomous database systems, is to provide capabilities to allow information units and resources to be exibly and dynamically combined and interconnected, while at the same time preserving the investment in and the autonomy of each individual component. The research described here speciically focuses on two key aspects of this: (1) how to discover the location and content of relevant, nonlocal information units, and (2) how to identify and resolve the semantic heterogeneity that exists between related information in diierent database components. Our approach serves as a basis for the sharing of related concepts through partial meta-data (conceptual schema) uniication without the need for a global view of data. We demonstrate and evaluate our approach using the Remote-Exchange experimental prototype system 5], which supports information sharing and exchange from the above perspective.