Exploiting Constraints in Query Processing

Name: Exploiting Constraints in Query Processing
Brand: LAP Lambert Academic Publishing
SKU: 9783838331508
Price: 26473 HUF
Availability: InStock

Query transformation using interity constraints and views

Szerző: Junhu Wang

Nyelv:

Kötés: Puha kötésű

Kiadó: LAP Lambert Academic Publishing

Elérhetőség: Beszállítói készleten

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This book focuses on the optimization of general conjunctive queries (GCQ) using integrity constrain...

Információk a könyvről

Szerző

Junhu Wang

Nyelv

Angol

Kötés

Könyv - Puha kötésű

Kiadva

2010

oldal

212

EAN

9783838331508

Enbook ID

07012470

Kiadó

LAP Lambert Academic Publishing

Súly

329

Méretek

150 x 220 x 13

Teljes leírás

This book focuses on the optimization of general conjunctive queries (GCQ) using integrity constraints and in the presence of materialized views. A GCQ is a conjunctive query with arbitrary built-in predicates. The integrity constraints we consider are disjunctive constrained tuple- generating dependencies (DCTGDs)which include many traditional integrity constraints such as functional dependencies, inclusion dependencies, and constrained tuple-generating dependencies. We first present an improved method for testing general conjunctive query containment using relevance mappings. We then present a method for testing general conjunctive query containment in the presence of DCTGDs. Our method generalizes and improves previous algorithms for the semantic containment problem of conjunctive queries. When materialized views exist, we study the problem of rewriting a union of general conjunctive queries using the view relations under the open world assumption and present a general approach for such problems. Our approach can rewrite unions of general conjunctive queries when both the query and the views involve built-in predicates.

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Exploiting Constraints in Query Processing

Query transformation using interity constraints and views

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