A heterogeneous database system is an automated (or semi-automated) system for the integration of heterogeneous, disparate database management systems to present a user with a single, unified query interface.
Heterogeneous database systems (HDBs) are computational models and software implementations that provide heterogeneous database integration.[1][2]
^Sujansky, Walter (August 2001). "Heterogeneous Database Integration in Biomedicine". Journal of Biomedical Informatics. 34 (4): 285–298. doi:10.1006/jbin.2001.1024. PMID 11977810.
^Sheth, Amit P.; James A. Larson (September 1990). "Federated Database Systems for Managing Distributed, Heterogeneous, and Autonomous Databases" (PDF). ACM Computing Surveys. 22 (3): 183–236. CiteSeerX 10.1.1.381.9176. doi:10.1145/96602.96604.
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