Efficient strategies for continuous distributed tracking tasksEfficient strategies for continuous distributed tracking tasks Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-12-012005enWhile traditional databases have focused on single query evaluation in a centralized setting, emerging applications require continuous tracking of queries on data that is widely distributed and constantly updated. We describe such scenarios, and describe the challenges involved in designing communication-efficient protocols for the tracking tasks we define. We outline some solutions to these problems, by abstracting a model of the communication system, defining the tracking tasks of interest, and building query-tracking schemes based on three guiding principles of minimizing global information, using summaries to capture whole data streams, and seeking stability of the protocols.http://creativecommons.org/licenses/by/4.0/IEEE Data Engineering Bulletin 28133-39 Cormode, Graham, 1977- Garofalakis Minos Γαροφαλακης Μινως Institute of Electrical and Electronics Engineers Information systems