queries over sensor networks sam madden uc berkeley database seminar october 5, 2001
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![Page 1: Queries over Sensor Networks Sam Madden UC Berkeley Database Seminar October 5, 2001](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d445503460f94a2126a/html5/thumbnails/1.jpg)
Queries over Sensor Networks
Sam Madden
UC Berkeley Database Seminar
October 5, 2001
![Page 2: Queries over Sensor Networks Sam Madden UC Berkeley Database Seminar October 5, 2001](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d445503460f94a2126a/html5/thumbnails/2.jpg)
Sensor Environment Recent Research at UCB, MIT, UCLA focused
on hardware, systems, and networking issues in sensors
Database researchers conspicuously absent Lots of data challenges
• Streaming data• Intermittent connectivity• Power / Bandwidth Limitations• No Storage• Very limited code space, RAM
![Page 3: Queries over Sensor Networks Sam Madden UC Berkeley Database Seminar October 5, 2001](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d445503460f94a2126a/html5/thumbnails/3.jpg)
Fjords Sensors push data Want to combine that
data with pre-existing tables Traffic Example
Fjords abstract push/pull into connection between operators Bracket Model (Graefe)
Revisted
![Page 4: Queries over Sensor Networks Sam Madden UC Berkeley Database Seminar October 5, 2001](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d445503460f94a2126a/html5/thumbnails/4.jpg)
Continuous Queries
Sensor environments involve lots of queries over same set of sensors E.g. Building information system,
environmental / scientific monitoring Opportunity for Continuous Queries
Improve on existing approaches with adaptivity, support for streams
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Aggregation in Sensor Networks
Push aggregates down into sensor networks to reduce data, power load on sensors
Take advantage of network topology
See Next Week’s DB Seminar