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Encyclopedia of Database Systems pp 634Cite as

Data Sketch/Synopsis

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Synonyms

Summary

Definition

A synopsis of dataset D is an abstract of D. A sketch is also referred to an abstract of dataset D but is usually referred to an abstract in a sampling method.

Key Points

Sketch/synopsis techniques have many applications. They are mainly used for statistics estimation in query processing optimization and for supporting on-line data analysis via approximate query processing. The goal is to develop effective and efficient techniques to build a small space synopsis while achieving high precision. For instance, a key component in query processing optimization is to estimate the result sizes of queries. Many techniques [1,2] have been developed for this purpose, including histograms, wavelets, and join synopses.

In data stream applications, the space requirements of synopses/sketches are critical to keep them in memory for on-line query processing. Streams are usually massive in size and fast at arrival rates; consequently it may be infeasible to keep a whole...

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Recommended Reading

  1. Alon N., Gibbons P.B., Matias Y., and Szegedy M. Tracking join and self-join sizes in limited storage. In Proc. 18th ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, 1999.

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  2. Gibbons P.B. and Matias Y. Synopsis data structures for massive data sets. In Proc. ACM-SIAM Symposium on Discrete Algorithms, 1999.

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  3. Zhang Y., Lin X., Xu J., Korn F., and Wang W. Space-efficient relative error order sketch over data streams. In Proc. 22nd Int. Conf. on Data Engineering, 2006.

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Author information

Authors and Affiliations

  1. University of New South Wales, Sydney, NSW, Australia

    Xuemin Lin

Authors
  1. Xuemin Lin
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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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Lin, X. (2009). Data Sketch/Synopsis. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_549

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