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An Approach Based on Bayesian Networks for Query Selectivity Estimation
The efficiency of a query execution plan depends on the accuracy of the selectivity estimates given to the query optimiser by the cost model. The cost model makes simplifying assumptions in order to
produce said estimates in a timely manner. These assumptions lead to selectivity estimation errors that have dramatic effects on the quality of the resulting query execution plans. A convenient assumption that is ubiquitous among current cost models is to assume that attributes are independent with each other. However, it ignores potential correlations which can have a huge negative impact on the accuracy of the cost model. In this paper we attempt to relax the attribute value independence assumption without unreasonably deteriorating the accuracy of the cost model. We propose a novel approach based on a particular type of Bayesian networks called Chow-Liu trees to approximate the distribution of attribute values inside each relation of a database. Our results on
the TPC-DS benchmark show that our method is an order of magnitude.
more precise than other approaches whilst remaining reasonably efficient
in terms of time and space.
Max Halford, Philippe Saint-Pierre, Franck Morvan

Minor Project
Shape feature extraction for image recognition with CNN using frequency domain
Palash Dahiphale

Saumitra Chauhan's CV
A small effort for internships and jobs. Created based on the Medium Length CV template.
Saumitra Chauhan

Vrbsky's resume
English resume of Ladislav Vrbsky
Ladislav Vrbsky

Monitoring of Global Economy in RBI
Monitoring of Global Economy in RBI
Narayan PRADHAN

OIST Beamer Template Dark
OIST Beamer Template Dark
Jeremie Gillet

Gdansk University of Technology thesis template
Gdansk University of Technology thesis template.
This template was originally published on ShareLaTeX and subsequently moved to Overleaf in November 2019.
Uploaded from ShareLaTeX

Nicholas Boshart's Résumé
Public résumé link.
Nicholas Boshart

Modelo Apresentação UNB
Modelo modificado para paleta de cores da UNB e apresentação com as logos disponibilizadas pelo próprio site da Universidade.
#Universidade de Brasília (UnB) #FGA
Luís Fernando