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aggregate query processing in sensor networks

This paper presents a query-driven approach to routing and processing continuous aggregate queries in sensor networks. Given a query workload and a special-purpose gateway node where results are expected, the query optimizer exploits query correlations in order to generate an energyefficient distributed evaluation plan.

aggregate query processing sensor networks

aggregate query processing sensor networks

three proposed techniques, and the aggregate query pro-cessor. Section 5 depicts the experiment results. Finally, Section 6 concludes this paper. 2. Related Works In this section, we highlight the related works in two areas, query processing in wireless sensor networks and spatio-temporal histograms. Query processing in sensor networks ... Acquisitional Query Processing In Sensor Networks 125 Section 6 discusses our adaptive, power-sensitive model for query execution and result collection. 2. SENSOR NETWORK OVERVIEW We begin with an overview of some recent sensor network deployments, and then discuss properties of sensor nodes and sensor networks in general, provid-

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IJA An Efficient Algorithm for Query Processing in Sensor

IJA An Efficient Algorithm for Query Processing in Sensor

1.1 Query Processing in Sensor Networks From databases perspective, innetwork aggregation is a mode for evaluating aggregate queries over the sensor network. Sensor network applications rely heavily on aggregate queries. Queries are also considered a natural way for users to interact with the sensor network 23. Therefore, several studies ... gate queries over sensor networks in an energyefcient manner. From the databases perspective, innetwork aggregation provides a mechanism for evaluating aggregate queries over sensor networks. The common approach to (aggre-gate) query processing in sensor networks has two phases the dissemination phase and the aggregation phase. For ...

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Aggregate Threshold Queries in Sensor Networks IEEE

Aggregate Threshold Queries in Sensor Networks IEEE

This paper presents a query-driven approach to routing and processing continuous aggregate queries in sensor networks. Given a query workload and a special-purpose gateway node where results are expected, the query optimizer exploits query correlations in order to generate an energyefficient distributed evaluation plan. niques designed for wireless sensor networks. On the other side, the aggregate query processing module is embedded in-side the server to support aggregate query processing over anonymized locations. TinyCasper system administrators can change the privacy requirement, i.e., k-anonymity re-quirement, at anytime. Finally, system users can issue snap-

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Robust and Efficient Aggregate Query Processing in

Robust and Efficient Aggregate Query Processing in

on sensor networks has been advocated 24, 29, with particular attention paid to efcient query processing for aggregation queries 24, 29, 31. In the TAG system 24, users connect to the sensor network using a workstation or base station directly connected to a sensor designated as the sink. Aggregate queries over the sensor data are ... region specied in the query is changed. Our query processing scheme is also related to aggregate queries in sensor networks. Even if many works have been proposed to process aggregate queries, only a few works deal with grouped aggregate queries. TAG 10 propose a grouped in-network aggregation method. In this method,

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Aggregate query processing in the presence of duplicates

Aggregate query processing in the presence of duplicates

Supporting Aggregate Queries Over Ad-Hoc Wireless Sensor Networks Samuel Madden UC Berkeley With Robert Szewczyk, Michael Franklin, and David Culler WMCSA June 21, 2002 Motivation Sensor Nets and In-Network Query Processing Many Sensor Network Applications are Data Oriented Queries Natural and Efficient Data Processing Mechanism Easy (unlike ... Mar 10, 2015 Aggregate query processing in the presence of duplicates in wireless sensor networks 1. Introduction. A wireless sensor network (WSN) consists of spatially distributed autonomous devices with various... 2. Preliminaries. We consider a sensor network consisting of n stationary sensor nodes s 1, s ...

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Interplay of Processing and Routing in Aggregate Query

Interplay of Processing and Routing in Aggregate Query

Jan 28, 2011 Sensor nodes are generally highly constrained, in particular regarding their energy and memory resources. While simple queries such as SELECT and AGGREGATE queries in wireless sensor networks have been addressed in the literature, the processing of join queries in sensor networks remain to be investigated. Aggregate queries (e.g., SUM, MAX, etc.) constitute a wide and important query class in sensor networks. In the naive case, the querier collects all the raw data from the sensors and performs the aggregation locally. Although this may be a vi-able solution in small networks, it leads to an excessive energy expenditure in large-scale networks.

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Interplay of processing and routing in aggregate query

Interplay of processing and routing in aggregate query

Dec 01, 2006 Processing approximate aggregate queries in wireless sensor networks 1. Introduction. Densely distributed sensor networks are used in a variety of monitoring applications ranging from... 3. In-network data aggregation. Depending on their application, sensor nodes typically operate under one of two ... Request PDF Robust and Efficient Aggregate Query Processing in Wireless Sensor Networks Wireless sensor networks have been widely used in many applications, such as

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REQUEST RegionBased Query Processing in Sensor

REQUEST RegionBased Query Processing in Sensor

Jan 05, 2008 This paper presents a novel approach to processing continuous aggregate queries in sensor networks, which lifts the assumption of tree-based routing. Given a query workload and a special-purpose gateway node where results are expected, the query optimizer exploits query correlations in order to generate an energy-efficient distributed evaluation plan. We present a novel approach to processing continuous aggregate queries in sensor networks, which lifts the as-sumption of tree-based routing. Given a query workload and a special-purpose gateway node where results are ex-pected, the query optimizer exploits query correlations in order to generate an energy-efcient distributed evaluation plan.

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Routing and Processing Multiple Aggregate Queries in

Routing and Processing Multiple Aggregate Queries in

Apr 22, 2011 Only a few approaches proposed the processing of grouped aggregate queries. However, since groups in their approaches are disjoint, some relevant regions to the query can be missing. In this paper, we propose REQUEST, region-based query processing in sensor networks. A region in our approach is defined as a maximal set of nodes located within a circle having a diameter specified in routing 4, 26 and in-network query processing 14, 15, 16, 28. A survey of the applications and the challenges that sensor networks introduce is presented in 10. For monitoring queries that aggregate the observed values from a group of sensor nodes, 14 suggested the construction of a greedy aggregation tree that seeks to maximize the ...

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Aggregate Location Monitoring for Wireless Sensor

Aggregate Location Monitoring for Wireless Sensor

Mar 30, 2007 Abstract An important class of queries over sensor networks are network-wide aggregation queries. In this work we study a class of aggregation queries which we refer to as aggregate threshold queries. The goal of an aggregate threshold query is to continuously monitor the network and give a notification every time an aggregated value crosses a predetermined threshold aggregate query processing in wireless sensor network. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda) In-network data aggregation has been recently proposed as an eective means to reduce the number of messages exchanged in wireless sensor networks.

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Robust Aggregation in Sensor Networks

Robust Aggregation in Sensor Networks

Intanagonwiwat et al. 2003. TinyDB is a query processing system that uses an SQL-like language to extract information from a sensor network. In particular, TinyDB uses a database view of the sensor network. Sensor measurements belong to a single (logical) table called sensors, which has one tuple for each node per time instant. Such detection of duplicates by several sensor nodes makes the in-network query evaluation very problematic. To alleviate the drawback of observing multiple sensing values for an identical object, deduplication of the duplicately observed objects by several sensor nodes is critical for aggregate query processing.

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Processing Approximate Aggregate Queries in

Processing Approximate Aggregate Queries in

Abstract. This paper presents a novel approach to processing continuous aggre-gate queries in sensor networks, which lifts the assumption of tree-based rout-ing. Given a query workload and a special-purpose gateway node where results are expected, the query optimizer exploits query correlations in order to gen-erate an energy-efcient distributed evaluation plan. The proposed optimization This study proposes a method of in-network aggregate query processing to reduce the number of messages incurred in a wireless sensor network. When aggregate queries are

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Optimizing innetwork aggregate queries in wireless sensor

Optimizing innetwork aggregate queries in wireless sensor

gregate query. Our contributions are as follows We present a new resilient execution paradigm for comput-ing aggregate queries in sensor networks. Our techniques dy-namically separate outliers from the outcome of the aggrega-tion. These unexpected readings are preserved and reported to the user that issued the query along with the estimate of to sensor network applications because the data needed for these applications is often geographically distributed in the network. Several approaches have been proposed that support window/range queries in sensor networks 5, 14, while a preliminary study of the KNN queries in sensor networks, called Peer-Tree , has just started 1. Peer-tree, a

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The Design and Evaluation of a Query Processing

The Design and Evaluation of a Query Processing

Recent sensor networks research has produced a class of data stor-age and query processing techniques called Data-Centric Storage that leverages locality-preserving distributedindexes like DIM,DIFS, and GHT to efciently answer multi-dimensional range and range-aggregate queries. These distributed indexes offer a rich design sensor network, we focus on the processing of spatial aggregation queries. 2.2 Spatial Aggregation Queries Without loss of generality, we assume that each sensor maintains data in the following form readings,loc. Based on the grid structured sensor network, our spatial aggregation query is expressed in an SQL-like syntax as exemplied in the ...

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LNCS 6588 REQUEST RegionBased Query Processing

LNCS 6588 REQUEST RegionBased Query Processing

Handling of multiple aggregate queries in Sensor Networks is a challenging task. Sensor Networks are vulnerable to security attacks due to the broadcast nature of communication. This section gives a brief insight into the two background works that lay a foundation for the development of SDACQ 1) SafeQ and 2) CDAMA. TinyDB In-Network Query Processing in TinyOS. Version 0.4, September 2003. 9. Samuel Madden, Robert Szewczyk, Michael J. Franklin, and David Culler. Supporting Aggregate Queries Over Ad-Hoc Wireless Sensor Networks.

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