http://www.cnr.it/ontology/cnr/individuo/prodotto/ID161111
Optimizing network-side queries with timestamp-join in wireless sensor networks (Rapporti tecnici, manuali, carte geologiche e tematiche e prodotti multimediali)
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- Label
- Optimizing network-side queries with timestamp-join in wireless sensor networks (Rapporti tecnici, manuali, carte geologiche e tematiche e prodotti multimediali) (literal)
- Anno
- 2009-01-01T00:00:00+01:00 (literal)
- Alternative label
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- Amato G.; Chessa S.; Vairo C. (literal)
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- Technical report, 2009. (literal)
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- ABSTRACT: This paper proposes a new method for optimizing innetwork distributed queries that perform join of data produced simultaneously by different sensors in a wireless sensor network. We adopt a modified version of the standard join operator that relates tuples having the same timestamp, and an optimized version of it, which provides on-demand, pull-mode, data acquisition from sensors. The optimizer uses an algebraic approach based on transformation rules and ordering of operators to generate and chose a query plan that reduces the query execution cost in terms of consumed energy. We implemented these join operations in a query processor for mica-class sensors and we performed extensive tests to prove that our approach may reduce energy required to process a long running query, by order of magnitudes,with respect to non optimized query plans. (literal)
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- Titolo
- Optimizing network-side queries with timestamp-join in wireless sensor networks (literal)
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