aggregate query processing sensor networks

Interplay of processing and routing in aggregate query ...

Interplay of processing and routing in aggregate query optimization for sensor networks Niki Trigoni Alexandre Guitton Antonios Skordylis Computing Laboratory, University of Oxford, Oxford OX1 3QD, UK Abstract. This paper presents a novel approach to processing continuous aggre-gate queries in sensor networks, which lifts the assumption of tree ...

definition of aggregate query processing

aggregate query processing definition - aggregate query processing definition, optimizing aggregate queries in cache. request: regionbased query processing in sensor networks. the processing of grouped aggregate queries. however, since a region in our approach is defined as a .. inside a circle having a diameter d by definition 1.

Continuous Quantile Query Processing in Wireless Sensor ...

Continuous Quantile Query Processing in Wireless Sensor Networks Johannes Niedermayer 1, Mario A. Nascimento 2, Matthias Renz 1, Peer Kröger 1 and Hans-Peter Kriegel 1 1 Institute for Computer Science, LMU, Munich, Germany 2 Dept. of Computing Science, University of Alberta, Canada {niedermayer, renz, kroeger, kriegel}@cip.i.lmu.de

LNCS 6588 - REQUEST: Region-Based Query Processing in ...

region speciﬁed 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,

Supporting Aggregate Queries Over Ad-Hoc Wireless Sensor ...

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 ...

Secure and Efﬁcient In-Network Processing of Exact SUM …

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.

Processing approximate aggregate queries in wireless ...

Aggregate queries. Approximation. 1. Introduction. Densely distributed sensor networks are used in a variety of monitoring applications ranging from measurements of meteorological data (like temperature, pressure, humidity), noise levels, chemicals etc., to complex military vehicle surveillance and tracking applications.

TinyDB: An Acquisitional Query Processing System for ...

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-

An Efficient Processing of Join Queries for Sensor ...

Many applications of sensor network such as vehicle tracking and environmental monitoring require joining s... An Efficient Processing of Join Queries for Sensor Networks Using Column-Oriented Databases - Kyung-Chang Kim, 2013

Optimized Query Processing for Wireless Sensor Networks

sensor networks is similar to saving and query processing in conventional database. Although infrastructure property and data properties of sensor networks is different with a central database system complementally [1]. We use declarative query in interaction networking. Declarative query playas an interface role. User able

Aggregate Threshold Queries in Sensor Networks - IEEE ...

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 …

SIA: Secure Information Aggregation in Sensor Networks

a setting, certain nodes in the sensor network, called aggregators, collect the raw information from the sensors, process it locally, and reply to the aggregate queries of a remote user. However, informa-tion aggregation in sensor networks is made even more challenging by the fact that the sensor nodes and aggregators deployed in hos-

LNCS 3882 - Processing Multiple Aggregation Queries in Geo ...

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 exempliﬁed in the ...

In-Network Execution of Monitoring Queries in Sensor …

sensor networks. Users acquire interesting data by issuing SQL-like queries while the underlying data retrieval and col-lection processes are transparent to them. Many of the early works on query processing in sensor networks have focused on aggregate queries such as COUNT, SUM and MAX, and have developed in-network aggregation techniques that sig-

Interplay of Processing and Routing in Aggregate Query ...

The TinyDB [8,9] and Cougar [14,15] projects investigate tree-based routing and scheduling techniques for processing aggregate queries like avg, count, sum, min and max in sensor networks. The concept of semantic routing trees (SRTs) [9] is used to forward queries only to children that satisfy the query …

Poster Abstract: Routing and Processing Multiple Aggregate ...

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.

Aggregate query processing in the presence of duplicates ...

Wireless sensor networks (WSNs) have received increasing attention in the past decade. In existing studies for query processing of WSNs, each sensor node measures environmental parameters such as ...

Assembling Regions for Efficacious Aggregate Query ...

Assembling Regions for Efficacious Aggregate Query Processing in Wireless Sensor Networks by Apostolos Fertis Diploma, Electrical and Computer Engineering (2003) National Technical University of Athens Submitted to the Department of Electrical Engineering and Computer Science in partial fulfillment of the requirements of

Routing and Processing Multiple Aggregate Queries in ...

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.

IJA: An Efficient Algorithm for Query Processing in Sensor ...

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.

A secure and efficient range query method for two‐layer ...

1 INTRODUCTION. Wireless sensor networks (WSNs), constituted of a large number of resource-limited sensor nodes, complete monitoring and investigation through data aggregation and query, creating a wide range of application scenes [1, 2].WSNs are applied to all aspects of life, such as national defence, military, aerospace, traffic management, environmental monitoring and so on [3, 4].

Optimizing in-network aggregate queries in wireless sensor ...

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 …

Implementing a Sensor Database System using a Generic Data ...

in-network processing in sensor networks. The ﬁlter framework [7] in Directed Diffusion allows custom code to run on the sensor nodes. Thus, ﬁlters can be used to process the information (aggregation) in the network before data reaches the querying node. TinyDBD is an attempt to use this architecture to implement an SQL-like query ...

Medians and Beyond: New Aggregation Techniques for …

nell University [24] (Cougar) have developed energy efﬁcient query processing architectures over sensor networks. Their approach is based on a couple of observations : ﬁrst, for a user, the individual sensor values do not hold much value. For example, in a sensor network spanning thousands of nodes, the user would like to know

TinyDB: An Acquisitional Query Processing System for ...

Prior systems, however, tend to view query processing in sensor networks simply as a power-constrained version of traditional query processing: given some set of data, they 1 This is a preliminary release of an article accepted by ACM Transactions on Database Systems.

TinyCasper: A Privacy-Preserving Aggregate Location ...

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-

Robust Aggregation in Sensor Networks

on sensor networks has been advocated [24, 29], with particular attention paid to efﬁcient 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 ...

The Design and Evaluation of a Query Processing ...

The Design and Evaluation of a Query Processing Architecture for Sensor Networks by Samuel Ross Madden B.S. (Massachusetts Institute of Technology) 1999 M.Eng. (Massachusetts Institute of Technology) 1999 A dissertation submitted in partial satisfaction of the requirements for the degree of Doctor of Philosophy in Computer Science in the ...