Abstract
A relational data base management system (named DMC) designed to provide administrative software with a high level view of an Electronic Switching System (ESS) database is described. DMC is primarily designed for the No. 4 ESS, a toll switching system, but its design concepts and requirements are, also applicable to other Electronic Switching Systems. A unique feature of DMC is its ability to access pre-defined physical data structures, thus providing a data independent interface to application programs. DMC provides many capabilities not commonly found in existing systems. Included in these are transaction oriented processing, flexible physical to logical level mappings, automatic enforcement of user definable integrity constraints, and automatic invocation of generalized triggers.
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