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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.

Manuscript template for RAIRO Operations Research as provided on the journal webpage; downloaded from the journal's FTP site on 16 March, 2019.

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Combined LaTeX Template and Instructions (updated January 2019) for KONA Powder and Particle Journal

The Journal of Mechatronics Engineering is a semiannually electronic publication created by the Federal Institute of Ceará - IFCE. The aim of this work is to contribute to the dissemination of knowledge through the publication of scientific papers (unpublished and original articles, reviews and scientific notes) in English language. Through this, work the editorial board of the journal invites researchers, professionals, undergraduate and graduate students to share their experiences with the scientific and academic community through our electronic journal.

A CONEXÕES - CIÊNCIA E TECNOLOGIA é uma publicação científica do Instituto Federal de Educação, Ciência e Tecnologia do Ceará (IFCE) que tem como objetivo publicar artigos que contribuam para o estudo de temas interdisciplinares e áreas afins. O periódico recebe contribuições em português e inglês. A Revista CONEXÕES - CIÊNCIA E TECNOLOGIA é indexada nas seguintes bases: Sistema eletrônico de editoração de revistas do IBICT (SEER) e no LATINDEX – http://www.latindex.unam.mx ISSN 1982-176X (versão impressa) ISSN 2176-0144 (versão on-line)

As instruções aqui contidas objetivam auxiliar os autores na preparação de documentos para impressão na Revista RITA. O resumo deve ser escrito na mesma língua do texto (Português, Inglês ou Espanhol) e descreve o conteúdo do texto em cerca de 150-200 palavras. Font Times, tamanho 10, margens laterais reduzidas em 1 cm de cada lado, com duas linhas em branco antes e depois do resumo. Formato abstract. Esta é a segunda versão das instruções e dos formatos e, portanto, sujeita a incorreções e omissões.

Visual Computing (VC) 2019 Template