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Reference.org
Heterogeneous database system
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<p>A heterogeneous database system is an automated (or semi-automated) system for the <a href="/facts/Data_integration/BU47JR28">integration</a> of heterogeneous, disparate <a href="/facts/Database_management_system/VYcpkevb">database management systems</a> to present a user with a single, unified query interface. </p><p>Heterogeneous database systems (HDBs) are computational models and software implementations that provide heterogeneous database integration. </p>