COMICS: A Global Constraint Manager for Interactive Component Database Systems

摘要

When several heterogeneous database systems are combined to a federation it is necessary to deal with the problem of maintaining the consistency of semantically interrelated data. The integrity constraints that are defined on the schemas of the federation's members must be monitored and ensured. In this paper we introduce the COMICS system, a global Constraint Manager for Interactive Component Database Systems, that is able to ensure strict consistency in a collection of autonomous and heterogeneous databases. The system uses the functionality of enhanced active databases to trigger a global integrity check from a local update operation.