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Performance Evaluation and Optimization of Queries in Multi Databases
Sambit Kumar Mishra
Livre broché | Anglais
35,45 €
+ 70 points
Description
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.
Spécifications
Parties prenantes
- Auteur(s) :
- Editeur:
Contenu
- Nombre de pages :
- 52
- Langue:
- Anglais
Caractéristiques
- EAN:
- 9783330079267
- Format:
- Livre broché
- Dimensions :
- 150 mm x 220 mm
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