Tasuta kohaletoimetamine tellimustele üle 29 €
  • check 10+ miljonit raamatut
  • check Uued tooted iga päev
  • check Meid usaldab üle 1 miljoni kliendi
  • check Hea hind ja allahindlused
  • check Tarne üle kogu Euroopa

Cardinality Estimation Techniques in Relational Database Systems - Xiaohui Yu

inglise keel
2008-07-03
65,97 € 109,95 €

-40% koodiga BOOKS

Meie tarnija laos

Saadetis 10-16 tööpäeva jooksul

30-päevane tagastamisõigus

Accurate and efficient cardinality estimation is of critical importance to many database operations. In this book, we study three cardinality estimation problems in the contexts of query optimization and data cleaning, and propose a set of new techniques to address the challenges arising therein. We first consider the problem of estimating the number of distinct value combinations for a set of attributes. W ... Täielik kirjeldus

Võib-olla meeldib sulle ka

Kirjeldus

Accurate and efficient cardinality estimation is of critical importance to many database operations. In this book, we study three cardinality estimation problems in the contexts of query optimization and data cleaning, and propose a set of new techniques to address the challenges arising therein. We first consider the problem of estimating the number of distinct value combinations for a set of attributes. We propose an estimator that utilizes the knowledge of marginal distributions of individual attributes, and establish upper and lower bounds on the estimate. In the second part of the book, we propose HASE, a hybrid approach to selectivity estimation. We formulate cardinality estimation as a constrained optimization problem, making consistent use of two sources of information (synopsis-based and sampling-based) when they are available. We provide algorithms and reason about the quality of the estimate. Finally, we study the problem of cardinality estimation for approximate joins, which are fundamental operations in data cleaning tasks. We propose two sampling-based schemes for estimation, one based on sampling tuples, and the other on sampling tokens.

Lisateave

Autor Xiaohui Yu
Kirjastaja VDM Verlag
Väljalaskeaasta 2008
Kaanetüüp Pehme kaanega
EAN 9783639041880
Kirjuta oma arvustus
Te vaatate: Cardinality Estimation Techniques in Relational Database Systems
Teie hinnang:

Goodreads'i arvustused

65,97 € 109,95 €