System R: relational approach to database management
ACM Transactions on Database Systems (TODS)
The design and implementation of INGRES
ACM Transactions on Database Systems (TODS)
Differential files: their application to the maintenance of large databases
ACM Transactions on Database Systems (TODS)
Communications of the ACM
A relational model of data for large shared data banks
Communications of the ACM
LSL: a Link and Selector Language
SIGMOD '76 Proceedings of the 1976 ACM SIGMOD international conference on Management of data
AFIPS '82 Proceedings of the June 7-10, 1982, national computer conference
Computer Communications
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Recent and foreseeable advances in the technologies of microprocessors and computer communications imply the viability of a new architecture for Data Base Management Systems which should develop into an attractive tool for many applications of distributed systems. The key aspect of this architecture is the data base server, a possibly portable microcomputer enabling remote access to and use of a subsidiary data base which is "refreshed" at intervals by communication with a central data-base system. The practicality of this arrangement depends upon achieving reasonable capability in the microcomputer. We describe a micro-DBMS called UNITY whose characteristics, as tested in one application of a working system, already approach those needed for use in certain applications. The command structure, hardware vehicle, and performance of UNITY are discussed, together with plans for current and future improvements.