Simulation of Schema Change Using Views

In this paper we concentrate on the description of change management functionalities that have been added to the commercially available O2 ODBMS to yield a platform suited for applications such as SDEs. A description of declarative high level schema update primitives is presented as well as mechanisms to propagate schema changes to the database. Particular emphasis is given to a mechanism that allows designers first to simulate schema and database modifications by means of object views, and second to materialize them to be propagated onto the real schema and base.