A relational model of data for large shared data banks
Communications of the ACM
AFIPS '82 Proceedings of the June 7-10, 1982, national computer conference
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The PHLOX project leads to three Data Base Management System (DBMS) packages for micro-computers: PHLOX1 for individual machines, PHLOX2 for servers managing data bases shared between several users in a local network, and PHLOX3, a Distributed DBMS for interconnected work stations. These packages have the essential possibilities of DBMSs that existed only (and not always) on bigger machines previously. The description of a data base can be given, checked and modified at three levels (relational, network and physical). The data manipulation language allows any operation using the relational or the network model, by direct interpretation or from host precompiled application programs. The system automatically and transparently insures the data base's consistency, in any situation (user's error, conflict of access or hardware incident). Thanks to their low cost, their reliability and their ease of operation, such systems can be used for integrated office automation, business management in small companies or documentation centers, as well as in computer aided design installations or medical centers.