QStream: Deterministic Querying of Data Streams

Current developments in processing data streams are based on the best-effort principle and therefore not adequate for many application areas. When sensor data is gathered by interface hardware and is used for triggering data-dependent actions, the data has to be queried and processed not only in an efficient but also in a deterministic way. Our streaming system prototype embodies novel data processing techniques. It is based on an operator component model and runs on top of a real-time capable environment. This enables us to provide real Quality-of-Service for data stream queries. 1 Motivation In recent years, the amount of data delivered by a variety of sensors has grown significantly. There are a lot of examples of sensors being installed to continuously measure physical properties and to send these values to back-end systems for further processing. Once a sensor data stream is connected to a stream processing system, the continuous/standing queries have to be evaluated on that d...

• Type: Conference
• Year: 2004
• Where: VLDB
• Authors: Sven Schmidt, Henrike Berthold, Wolfgang Lehner
• Keywords: Data Stream, Database, Sensor Data, Sensors, VLDB 2004