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Query Processing in Database Systems

Name: Query Processing in Database Systems
Brand: Springer, Berlin
SKU: 07061316
Price: 39688 HUF
Availability: InStock
Author: Don Batory
ISBN: 9783642823770

Don Batory

W. Kim

D. S. Reiner

Language

English

Book Paperback

Libristo code: 07061316

Publishers Springer, Berlin, November 2012

This book is an anthology of the results of research and development in database query processing du... Full description

Libristo code: 07061316

271 b

39 688 Ft

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This book is an anthology of the results of research and development in database query processing during the past decade. The relational model of data provided tremendous impetus for research into query processing. Since a relational query does not specify access paths to the stored data, the database management system (DBMS) must provide an intelligent query-processing subsystem which will evaluate a number of potentially efficient strategies for processing the query and select the one that optimizes a given performance measure. The degree of sophistication of this subsystem, often called the optimizer, critically affects the performance of the DBMS. Research into query processing thus started has taken off in several directions during the past decade. The emergence of research into distributed databases has enormously complicated the tasks of the optimizer. In a distributed environment, the database may be partitioned into horizontal or vertical fragments of relations. Replicas of the fragments may be stored in different sites of a network and even migrate to other sites. The measure of performance of a query in a distributed system must include the communication cost between sites. To minimize communication costs for-queries involving multiple relations across multiple sites, optimizers may also have to consider semi-join techniques.