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Data Exchange

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Encyclopedia of Database Systems
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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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Correspondence to Lucian Popa .

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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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