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Encyclopedia of Database Systems pp 1486–1487Cite as

Flex Transactions

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Synonyms

ConTracts; Flexible transactions; S-transactions

Definition

In database systems, a transaction is a sequence of actions performed on data items in a database. In a distributed database environment, a global transaction is a set of subtransactions, where each subtransaction is a transaction accessing the data items at a single local site. The flex transaction model supports flexible execution control flow by specifying two types of dependencies among the subtransactions of a global transaction: (i) execution ordering dependencies between two subtransactions, and (ii) alternative dependencies between two subsets of subtransactions.

Key Points

Flexible transaction models, such as ConTracts, Flex Transactions, S-transactions, and others [6108,6109,3], increase the failure resilience of global transactions by allowing alternate subtransactions to be executed when a local database site fails or a subtransaction aborts. In a non-flexible transaction, a global subtransaction abort is...

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Recommended Reading

  1. Wächter H, Reuter A. The ConTract model. In: Elmagarmid AK, editor. Database transaction models for advanced applications. Los Altos: Morgan Kaufmann; 1992.

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  2. Zhang A, Nodine M, Bhargava B. Global scheduling for flexible transactions in heterogeneous distributed database systems. IEEE Trans Knowl Data Eng. 2001;13(3):439–50.

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  3. Zhang A, Nodine M, Bhargava B, Bukhres O. Ensuring relaxed atomicity for flexible transactions in multidatabase systems. In: Proceedings of ACM SIGMOD International Conference on Management of Data; 1994. p. 67–78.

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Author information

Authors and Affiliations

  1. State University of New York, Buffalo, NY, USA

    Aidong Zhang

  2. Purdue University, West Lafayette, IN, USA

    Bharat Bhargava

Authors
  1. Aidong Zhang
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  2. Bharat Bhargava
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Corresponding author

Correspondence to Aidong Zhang .

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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© 2018 Springer Science+Business Media, LLC, part of Springer Nature

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Zhang, A., Bhargava, B. (2018). Flex Transactions. 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_726

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