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Encyclopedia of Database Systems pp 3533–3538Cite as

Window-based Query Processing

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Synonyms

Stream query processing

Definition

Data Streams are infinite in nature. As a result, a query that executes over data streams specifies a “window” of focus or the part of the data stream that is of interest to the query. When new data items arrive into the data stream, the window may either expand or slide to allow the query to process these new data items. Hence, queries over data streams are continuous in nature, i.e., the query is continuously re-evaluated each time the query window slides. Window-based query processing on data streams refers to the various ways and techniques for processing and evaluating continuous queries over windows of data stream items.

Historical Background

Windows over relational tables have already been introduced into Standard SQL (SQL:1999) in order to support data analysis, decision support, and more generally, OLAP-type operations.

However, the motivation for having windows in data stream management systems is quite different. Since data streams...

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Author information

Authors and Affiliations

  1. Purdue University, West Lafayette, IN, USA

    Walid G. Aref

Authors
  1. Walid G. Aref
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Editor information

Editors and Affiliations

  1. College of Computing, Georgia Institute of Technology, 266 Ferst Drive, 30332-0765, Atlanta, GA, USA

    LING LIU (Professor) (Professor)

  2. Database Research Group David R. Cheriton School of Computer Science, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada

    M. TAMER ÖZSU (Professor and Director, University Research Chair) (Professor and Director, University Research Chair)

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© 2009 Springer Science+Business Media, LLC

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Aref, W.G. (2009). Window-based Query Processing. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_468

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