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2018 | OriginalPaper | Buchkapitel

Dependency-Based Query/View Synchronization upon Schema Evolutions

verfasst von : Loredana Caruccio, Giuseppe Polese, Genoveffa Tortora

Erschienen in: Advances in Conceptual Modeling

Verlag: Springer International Publishing

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Abstract

Query/view synchronization upon the evolution of a database schema is a critical problem that has drawn the attention of many researchers in the database community. It entails rewriting queries and views to make them continue work on the new schema version. Although several techniques have been proposed for this problem, many issues need yet to be tackled for evolutions concerning the deletion of schema constructs, hence yielding loss of information. In this paper, we propose a new methodology to rewrite queries and views whose definitions are based on information that have been lost during the schema evolution process. The methodology exploits (relaxed) functional dependencies to automatically rewrite queries and views trying to preserve their semantics.

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Vorheriges Kapitel Visual Non-verbal Social Cues Data Modeling

Nächstes Kapitel Knowledge Graph Embedding via Relation Paths and Dynamic Mapping Matrix

A mapping m between two schemas S and \(S'\) is a set of assertions of the form \(q_S\rightsquigarrow q_{S'}\), where \(q_S\) and \(q_{S'}\) are queries over S and \(S'\), respectively, with the same set of distinct variables, and \(\rightsquigarrow {\in } \{ \subseteq , \supseteq , \equiv \}\).

The view extent is the usually adopted term indicating the result-set of a view statement, i.e. the materialized view.

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Titel: Dependency-Based Query/View Synchronization upon Schema Evolutions
verfasst von: Loredana Caruccio
Giuseppe Polese
Genoveffa Tortora
Verlag: Springer International Publishing
Buch: Advances in Conceptual Modeling
Print ISBN: 978-3-030-01390-5

Electronic ISBN: 978-3-030-01391-2

Copyright-Jahr: 2018
DOI: https://doi.org/10.1007/978-3-030-01391-2_17

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