A cooperation system for heterogeneous data base management systems

摘要

We propose here a functional architecture of a cooperation system for heterogeneous DBMS in a network environment. Our basic assumptions are:—The existence of different local data bases already in use under DBMSs like IMS, Codasyl-like systems, SOCRATE, relational systems, etc …—The existence of a computer network, with facilities to establish communications between these DBMS. The cooperation system should be able to support several local data base descriptions and also to provide facilities for creating and modifying a global view of these local data bases. Furthermore it provides some mechanisms in order to construct, decompose and execute global application programs involving, through the global view, all the local data bases. We expect the local user will not be affected by this cooperation mechanism.