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Relational database
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==Distributed relational databases== [[DRDA|Distributed Relational Database Architecture]] (DRDA) was designed by a workgroup within IBM in the period 1988 to 1994. DRDA enables network connected relational databases to cooperate to fulfill SQL requests.<ref>{{cite journal |last1=Reinsch |first1=R. |date=1988 |title=Distributed database for SAA |journal=IBM Systems Journal |volume=27 |issue=3 |pages=362β389 |doi=10.1147/sj.273.0362}}</ref><ref>{{cite book |date=1990 |title=Distributed Relational Database Architecture Reference |publisher=IBM Corp. SC26-4651-0}}</ref> The messages, protocols, and structural components of DRDA are defined by the [[Distributed Data Management Architecture]].
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