5. Distributed data localization

We'll now take a look at the restructuring of queries, taking into account the fragmentation of the database in a distributed context.

5.1 Horizontal fragmentation

Let's assume that the ASSURES relationship is horizontally fragmented (fragmentation based on selection operations), as follows:

A1 : σ _{DPT < 31} (INSURED)

A2: σ _{DPT = 31} (INSURED)

A3: σ _{DPT > 31...}

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Distributed data localization

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(1) - CHRISMENT (C.), PUJOLLE (G.), ZURFLUH (G.) - Langages de bases de données SQL et les évolutions vers l'objet. - H3128, traité Informatique. Techniques de l'Ingénieur, août 1999.
(2) - Heterogeneous Distributed Database Systems. - Computer – Special...

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