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Encyclopedia of Database Systems pp 3273Cite as

Sagas

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Definition

A saga [3] is a sequence of atomic transactions T1 , … , Tn for which the following execution guarantee is made. Either the component transactions Ti will all commit in the order:

$$ {T}_1{T}_2,\dots, {T}_n $$

in which case that saga is said to have committed or one of the transaction sequences

$$ {T}_1,\dots, {T}_j{C}_j,\dots, C $$

will be executed (for some 0 ≤ j < n), in which case the saga is said to have aborted. The transactions Ci are compensating transactions for the corresponding saga transactions Ti. Each transaction Ti in a saga must have a corresponding compensating transaction, which is responsible for undoing the Ti′s effects.

Key Points

A saga is a type of extended transaction model [1]. Each component transaction in a saga is executed atomically, but the saga itself is not atomic. Effects of the component transactions are visible to other operations as soon as those transactions commit, which may be well before the saga has finished.

The saga model guarantees...

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Recommended Reading

  1. Chrysanthis PK, Ramamritham K. Synthesis of extended transaction models using ACTA. ACM Trans Database Syst. 1994;19(3):450–91.

    Article  Google Scholar 

  2. Garcia-Molina H. Using semantic knowledge for transaction processing in a distributed database. ACM Trans Database Syst. 1983;8(2):186–213.

    Article  MATH  Google Scholar 

  3. Garcia-Molina H, Salem K. Sagas. In: Proceedings of the ACM SIGMOD International Conference on Management of Data; 1987. p. 249–59.

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Author information

Authors and Affiliations

  1. University of Waterloo, Waterloo, ON, Canada

    Kenneth Salem

Authors
  1. Kenneth Salem
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Correspondence to Kenneth Salem .

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. Department of Computer Science, University of Pittsburgh, Pittsburgh, PA, USA

    Panos K. Chrysanthis

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Salem, K. (2018). Sagas. 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_724

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