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Erschienen in:
2005 | OriginalPaper | Buchkapitel
Control-Based Quality Adaptation in Data Stream Management Systems
verfasst von : Yi-Cheng Tu, Mohamed Hefeeda, Yuni Xia, Sunil Prabhakar, Song Liu
Erschienen in: Database and Expert Systems Applications
Verlag: Springer Berlin Heidelberg
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Unlike processing snapshot queries in a traditional DBMS, the processing of continuous queries in a data stream management system (DSMS) needs to satisfy quality requirements such as processing delay. When the system is overloaded, quality degrades significantly thus load shedding becomes necessary. Maintaining the quality of queries is a difficult problem because both the processing cost and data arrival rate are highly unpredictable. We propose a quality adaptation framework that adjusts the application behavior based on the current system status. We leverage techniques from the area of control theory in designing the quality adaptation framework. Our simulation results demonstrate the effectiveness of the control-based quality adaptation strategy. Comparing to solutions proposed in previous works, our approach achieves significantly better quality with less waste of resources.