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Encyclopedia of Database Systems pp 1–4Cite as

Semijoin Program

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Synonyms

Semijoin reducer

Definition

A semijoin program is a query execution plan for queries to distributed database systems that uses semijoins to reduce the size of relation instances before they are transmitted and further joined. Yet the reduction itself requires that a projection of the relation instances involved in the join onto the join attributes be transmitted. The maximum amount of reduction can be achieved by a semijoin program called a full reducer. Full reducers that do not require the computation of a fixpoint exist for acyclic queries. Fully reducing relation instances is rarely beneficial. However semijoin programs partially reducing selected relation instances may be an effective optimization when the dominant cost of query execution is communication. Considering semijoin programs considerably increases the distributed query optimization search space.

Historical Background

Semijoin programs were first introduced to improve the performance, input/output operations and...

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Recommended Reading

  1. Bernstein PA, Chiu D-MW. Using semi-joins to solve relational queries. J ACM. 1981;28(1):25–40.

    Article  MATH  Google Scholar 

  2. Bernstein PA, Goodman N. Power of natural semijoins. SIAM J Comput. 1981;10(4):751–71.

    Article  MathSciNet  MATH  Google Scholar 

  3. Bernstein PA, Goodman N, Wong E, Reeve CL, Rothnie Jr JB. Query processing in a system for distributed databases (SDD-1). ACM Trans Database Syst. 1981;6(4):602–25.

    Article  MATH  Google Scholar 

  4. Ceri S, Pelagatti G. Distributed databases: principles and systems. New York: McGraw-Hill; 1984.

    MATH  Google Scholar 

  5. Fagin R. Degrees of acyclicity for hypergraphs and relational database schemes. J ACM. 1983;30(3):514–50.

    Article  MathSciNet  MATH  Google Scholar 

  6. Lal A, Choueiry BY. Constraint processing techniques for improving join computation: a proof of concept. In: Proceedings of 1st International Symposium on Applications of Constraint Databases; 2004. p. 149–67.

    Google Scholar 

  7. Ozkarahan EA, Schuster SA, Sevcik KC. Performance evaluation of a relational associative processor. ACM Trans Database Syst. 1977;2(2):175–95.

    Article  Google Scholar 

  8. Stocker K, Kossmann D, Braumandl R, Kemper A. Integrating semi-join-reducers into state of the art query processors. In: Proceedings of 17th International Conference on Data Engineering; 2001. p. 575–84.

    Google Scholar 

  9. Ullman JD. Principles of database and knowledge-base systems, vol. II. Rockville: Computer Science; 1989.

    Google Scholar 

  10. Valduriez P, Gardarin G. Join and semijoin algorithms for a multiprocessor database machine. ACM Trans Database Syst. 1984;9(1):133–61.

    Article  Google Scholar 

  11. Wallace M, Bressan S, Provost TL. Magic checking: constraint checking for database query optimization. In: Proceedings of ESPRIT WG CONTESSA workshop on constraint databases and applications. LNCS, vol. 1034. Springer; 1995. p. 148–66.

    Google Scholar 

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Author information

Authors and Affiliations

  1. National University of Singapore, School of Computing Department of Computer Science, Singapore, Singapore

    Stéphane Bressan

Authors
  1. Stéphane Bressan
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Corresponding author

Correspondence to Stéphane Bressan .

Editor information

Editors and Affiliations

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

    Ling Liu

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

    M. Tamer Özsu

Section Editor information

  1. Dept. of Computer Science, National Univ. of Singapore, 3 Science Drive 2, 117543, Singapore, Singapore

    Kian-Lee Tan

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Bressan, S. (2016). Semijoin Program. In: Liu, L., Özsu, M. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4899-7993-3_709-2

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  • DOI: https://doi.org/10.1007/978-1-4899-7993-3_709-2

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  • Publisher Name: Springer, New York, NY

  • Online ISBN: 978-1-4899-7993-3

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