Performance Evaluation and Optimization of Queries in Multi Databases

Language: English

Published by LAP LAMBERT Academic Publishing, 2017

3330079266 / 9783330079267

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nach der Bestellung gedruckt Neuware - Printed after ordering - Modern database systems use a query optimizer to identify query plan to execute declarative SQL queries. Optimization is a mandatory exercise since the difference between the cost of the best plan and a random choice could be in orders of magnitude. The role of query optimizers is especially critical for the decision-support queries featured in data warehousing and data mining applications. For a query on a given database and system configuration, the optimizer's plan choice is primarily a function of the selectivities of the base relations participating in the query. In this chapter, it has been projected towards the cost of sub-query operations on the various sites, as well as the benefits achieved in the range of thirty to forty percent for various sub-operations like selection, projection and join.

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Title
Performance Evaluation and Optimization of Queries in Multi Databases
Author
Sambit Kumar Mishra
Publisher
LAP LAMBERT Academic Publishing
Publication year
2017
Condition
Neu
Binding
Taschenbuch
Language
English
ISBN 10
3330079266
ISBN 13
9783330079267
Item weight
96 grams
Dimensions
220x150x4 mm

AHA-BUCH GmbH

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