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Flex Transactions

  • Reference work entry
Encyclopedia of Database Systems

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Synonyms

Flexible transactions; S-transactions; ConTracts

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 [1–3], 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. and Reuter A. The ConTract model. In Database Transaction Models for Advanced Applications, A.K. Elmagarmid (ed.). Morgan Kaufmann, Los Altos, CA, 1992.

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  2. Zhang A., Nodine M., and Bhargava B. Global scheduling for flexible transactions in heterogeneous distributed database systems. IEEE Trans. Knowl. Data Eng., 13(3):439–450, 2001.

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  3. Zhang A., Nodine M., Bhargava B., and Bukhres O. Ensuring relaxed atomicity for flexible transactions in multidatabase systems. In Proc. ACM SIGMOD Int. Conf. on Management of Data, 1994, pp. 67–78.

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Author information

Authors and Affiliations

  1. State University of New York at Buffalo, 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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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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Zhang, A., Bhargava, B. (2009). Flex Transactions. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_726

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