SUPPORTING DATA COMPLETENESS IN ACTIVE DATABASES
J.A. Bakker and J.H. ter Bekke
compare two approaches to the maintenance of derivable data: a relational
approach based on materialized views and a semantic approach based on
declarative assertions. In particular we examine whether they can support
completeness of data sets. None of these approaches is able to support adequate
automatic actions if a database system perceives data incompleteness, because
these systems do not have knowledge about the involved real world. Therefore a
solution should rely on the ability of users to specify adequate actions. An
essential part of the solution is to specify the required cardinality of a data
set and to compare it with the actually calculated cardinality. In the case of a conflict, the
involved user must be informed about the cause of the conflict and this user
must execute some adequate action(s) until the conflict is resolved.
Keywords: Assertions, Data Completeness,
Databases, Materialized Views.
of the Sixth IASTED International Conference on Artificial Intelligence and
Soft Computing (ASC 2002), Banff, Canada, pp. 113-117.
ACTA Press, Anaheim, Calgary, Zürich