Queries%20over%20Sensor%20Networks

1
Queries over Sensor Networks

• Sam Madden
• UC Berkeley Database Seminar
• October 5, 2001

2
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

3
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

4
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

5
Aggregation in Sensor Networks

• Push aggregates down into sensor networks to
  reduce data, power load on sensors
• Take advantage of network topology
• See Next Weeks DB Seminar