A-mediAS: an adaptive event notification system
Proceedings of the 2nd international workshop on Distributed event-based systems
Efficient filtering of composite events
BNCOD'03 Proceedings of the 20th British national conference on Databases
Design of B+tree-based predicate index for efficient event matching
APWeb'03 Proceedings of the 5th Asia-Pacific web conference on Web technologies and applications
Relevance-Based adaptive event communication for mobile environments with variable qos capabilities
MMNS'05 Proceedings of the 8th international conference on Management of Multimedia Networks and Services
Dimension transform based efficient event filtering for symmetric publish/subscribe system
DEXA'05 Proceedings of the 16th international conference on Database and Expert Systems Applications
DASFAA'05 Proceedings of the 10th international conference on Database Systems for Advanced Applications
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Event notification services are used in various applications, for example, stock tickers, environmental monitoring, and facility management. Several filtering algorithms for such services have been proposed. The best performance results are achieved by tree-based algorithms. However, to our knowledge existing algorithms do not consider the influence of event and profile distribution on the filter performance. In this paper we propose a distribution-dependent improvement of the tree-algorithm. We present the test results of our prototypical implementation that show the influence of various distribution-based measures on the performance.