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Inter-query Parallelism

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  • First Online:
Encyclopedia of Database Systems

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Synonyms

User-level parallelism

Definition

Inter-query parallelism is a form of parallelism in the evaluation of database queries, in which several different queries execute concurrently on multiple processors to improve the overall throughput of the system.

Key Points

When multiple non-conflicting requests are submitted to a database management system, then the system can execute them in parallel to improve the overall throughput [1]. This form of parallelism is called inter-query parallelism. Inter-query parallelism is a consequence of the concurrency of user requests. It is orthogonal to intra-query parallelism, in which several processors cooperate for the faster execution of a single query [2]. Both forms of parallelism can co-exist in a database management system. Inter-query parallelism is common in on-line transaction processing (OLTP), where multiple concurrent users submit requests to the system. It is a challenge for the database management system to achieve high...

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Recommended Reading

  1. DeWitt DJ, Gray J. Parallel database systems: the future of high-performance database computing. Commun ACM. 1992;35(6):85–98.

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  2. Graefe G. Encapsulation of parallelism in the volcano query processing system. In: Proceedings of the ACM SIGMOD International Conference on Management of Data; 1990. p. 102–11.

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Author information

Authors and Affiliations

  1. Carnegie Mellon University, Pittsburgh, PA, USA

    Nikos Hardavellas & Ippokratis Pandis

  2. Amazon Web Services, Seattle, WA, USA

    Ippokratis Pandis

Authors
  1. Nikos Hardavellas
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  2. Ippokratis Pandis
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Corresponding author

Correspondence to Nikos Hardavellas .

Editor information

Editors and Affiliations

  1. Georgia Institute of Technology College of Computing, Atlanta, GA, USA

    Ling Liu

  2. University of Waterloo School of Computer Science, Waterloo, ON, Canada

    M. Tamer Özsu

Section Editor information

  1. Informatique et Communications, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland

    Anastasia Ailamaki

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Hardavellas, N., Pandis, I. (2018). Inter-query Parallelism. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_1556

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