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Encyclopedia of Database Systems pp 2775–2776Cite as

Polytransactions

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Definition

A polytransaction T+ is a transitive closure of a transaction T submitted to an Interdependent Data Management System (a type of a multidatabase system which enforces dependencies among related data objects). The transitive closure is computed with respect to an Interdatabase Dependency Schema (IDS) consisting of a collection of data dependency descriptors (D3s), which specify the dependencies between data objects.

Key Points

Data objects in multiple (possibly distributed and/or heterogeneous) systems which form dependencies among them are called interdependent data. These dependencies are identified through data dependency descriptors (D3s). A D3 specifies the relationships between source and target objects including how much inconsistency can be tolerated between them before it is necessary to restore it, and the actions to take to maintain consistency when it reaches intolerable levels. All these D3s together form an Interdatabase Dependency Schema (IDS) [3].

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Recommended Reading

  1. Karabatis G, Rusinkiewicz M, Sheth A. Correctness and enforcement of multidatabase interdependencies. In: Advanced database systems LNCS, vol 759. London: Springer; 1993. p. 337–58.

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  2. Karabatis G, Rusinkiewicz M, Sheth A. Interdependent database systems. In: Elmagarmid A, Rusinkieuicz M, Sheth A, editors. Management of heterogeneous and autonomous database systems. San Francisco: Morgan-Kaufmann; 1999. p. 217–52.

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  3. Rusinkiewicz M, Sheth A, Karabatis G. Specifying interdatabase dependencies in a multidatabase environment. IEEE Comput. 1991;24(12):46–53.

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Author information

Authors and Affiliations

  1. University of Maryland, Baltimore Country (UMBC), Baltimore, MD, USA

    George Karabatis

Authors
  1. George Karabatis
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Corresponding author

Correspondence to George Karabatis .

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. Dept. of Computer Science, Univ. of Pittsburgh, Pittsburgh, PA, USA

    Panos K. Chrysanthis

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Karabatis, G. (2018). Polytransactions. 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_732

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