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Optimierung von Nested Queries unter Verwendung der NF2-Algebra

Optimierung von Nested Queries unter Verwendung der NF2-Algebra

Jürgen Hölsch

60,89 €
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Editorial:
Springer Nature B.V.
Año de edición:
2016
Materia
Guías de Internet y servicios en línea
ISBN:
9783658126094
60,89 €
IVA incluido
Disponible

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Sobre IBD

Jürgen Hölsch erarbeitet einen neuen Ansatz zur Optimierung von verschachtelten SQL-Anfragen (Nested Queries), einem wichtigen Teilgebiet der Datenbankforschung. Es gelingt ihm, diese Anfragen im gleichen Schritt wie alle übrigen Optimierungen zu behandeln. Dazu werden SQL-Anfragen mithilfe der Non-First Normal Form (NF2)-Algebra dargestellt, die ursprünglich dazu entwickelt wurde, Anfragen auf verschachtelten Tabellen zu beschreiben. Da diese Algebra im Gegensatz zur relationalen Algebra den heutigen Stand von SQL nahezu 1:1 abbilden kann, können bekannte und auch neue Optimierungstechniken für verschachtelte Anfragen formalisiert werden. Die Anwendbarkeit wird anhand der praktischen Umsetzung des Ansatzes in einem Anfrageoptimierer und den daraus resultierenden Performance-Gewinnen demonstriert.

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