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Query Decomposition, Optimization and Processing in Multidatabase Systems

One way of achieving interoperability among heterogeneous, federated DBMSs is through a multidatabase system that supports a single common data model and a single global query language on top of different types of existing systems. The global schema of a multidatabase system is the result of a schema integration of the schemas exported from the underlying databases, i.e., local databases. A global query language is used by users of the multidatabase system to specify queries against the global schema.