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Distributed Join

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Encyclopedia of Database Systems

Synonyms

Join processing; Distributed query

Definition

The distributed join is a query operator that combines two relations stored at different sites in the following way: each tuple from the first relation is concatenated with each tuple from the second relation that satisfies a given join condition, e.g., the match in two attributes. The main characteristics of a distributed join is that at least one of the operand relations has to be transferred to another site.

Historical Background

Techniques for evaluating joins on distributed relations have already been dy discussed in the context of the first prototypes of distributed database systems such as SDD-1, Distributed INGRES and R*. In [6] the basic strategies ship whole vs. fetch matches were discussed and results of experimental evaluations were reported. Another report on an experimental comparison of distributed join strategies was given in [5].

Special strategies for distributed join evaluation that aim at reducing the transfer...

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Recommended Reading

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Author information

Authors and Affiliations

  1. Technical University of Ilmenau,  , Ilmenau, Germany

    Kai-Uwe Sattler

Authors
  1. Kai-Uwe Sattler
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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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Sattler, KU. (2009). Distributed Join. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_705

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