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Data Exchange

  • Reference work entry
  • First Online:
Encyclopedia of Database Systems

  • 72 Accesses

Synonyms

Data migration; Data translation; Data transformation

Definition

Data exchange is the problem of materializing an instance of a target schema, given an instance of a source schema and a specification of the relationship between the source schema and the target schema. More precisely, a data exchange setting is a quadruple of the form (S, T, Σst, Σt), where S is the source schema, T is the target schema, Σst is a schema mapping that expresses constraints between S and T, and Σt is a set of constraints on T. Such a setting gives rise to the following data exchange problem: given an instance I over the source schema S, find an instance J over the target schema T such that I and J together satisfy the schema mapping Σst, and J satisfies the target constraints Σt. Such an instance J is called a solution for I in the data exchange setting. In general, many different solutions for an instance Imay exist. The main focus of the data exchange research is to study the space of all...

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Author information

Authors and Affiliations

  1. IBM Almaden Research Center, San Jose, CA, USA

    Lucian Popa

Authors
  1. Lucian Popa
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Corresponding author

Correspondence to Lucian Popa .

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, University of Toronto, Department of Computer Science, Toronto, ON, Canada

    Renée J. Miller

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Popa, L. (2018). Data Exchange. 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_960

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