Schema Evolution publication categorizer

When the schema of an object-oriented database system
is modified, the database needs to be changed in
such a way that the schema and the database remain
consistent with each other. This paper describes the
algorithm implemented in the new forthcoming release
of the O2 object database for automatically bringing the
database to a consistent state after a schema update has
been performed. The algorithm, which uses a deferred
strategy to update the database, is a revised and extended
version of the screening algorithm first sketched in [7].