Maintaining consistency in a database with changing types

Abstract

In this work, we address the problem of maintaining consistency between a set of persistent objects and a set of type definitions that can change. We cast this work in the context of an object-oriented database system. The solution involves the use of a version control mechanism and a set of error handlers associated with the versions of a type. We describe the structure of this error handling mechanism and demonstrate how it can be used to address this problem.