EFFICIENT MAINTENANCE OF DERIVED INFORMATION
IN ACTIVE DATABASES
Bakker and J.H. ter Bekke
Consistency of derived
data can be dealt with by approaches such as materialized views or procedural
rules. These solutions cannot be applied in the declarative Xplain approach,
which requires a rule to be specified in terms of a derivable variable and a
calculation, independent of the triggering event. If an event triggers the
evaluation of a rule (assertion) specifying a set calculation, this could lead
to a superfluous recalculation of data. Therefore, depending on the kind of
triggering event, this paper presents a solution for the transformation of a
set operation into a more efficient calculation.
Keywords: Active Databases,
Declarative Rules, Intelligent Databases, Rule Transformation.
of the Sixth IASTED International Conference on Artificial Intelligence and
Soft Computing (ASC 2002), Banff, Canada, pp. 118-122.
ACTA Press, Anaheim, Calgary, Zürich