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Supports Pour Loptimisation De Requetes
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Book Synopsis Supports pour l'optimisation de requêtes by : Laurent Némirovski
Download or read book Supports pour l'optimisation de requêtes written by Laurent Némirovski and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans cette thèse, nous avons développé deux outils qui sont des supports pour l'optimisation de requêtes. Le premier cherche à améliorer la précision du modèle de coût. Lors de l'optimisation physique, il est important de savoir évaluer de manière assez précise le nombre de pages mémoires auxquelles il faut accéder lors d'un accès disque. Ce nombre de pages dépend bien évidemment en premier lieu du nombre d'éléments (n-uplets ou objets selon que l'on soit dans un système objet ou relationnel) que l'on cherche. Il dépend également de la répartition de ces éléments. Différents types d'éléments sont stockés dans une base de données. Toutefois, il existe une logique qui les fait coexister dans la même base. En général, il existera donc une corrélation entre les différents types de données stockées dans la base. Pour être précis, il faudra prendre en compte cette corrélation quand nous ferons notre évaluation. Notre modélisation prend en compte tous ces paramètres pour calculer l'évaluation du nombre de pages. Le deuxième outil se situe au niveau de l'optimisation logique. Le schéma est un élément central de la base de données. En effet, il permet entre autre de renseigner l'utilisateur sur le contenu de la base de données. Les bases de données semi-structuréesn'imposent pas un schéma préalablement établi des données. En effet, celles-ci étant intégrées de l'extérieur, on ne peut leur imposer une forme prédéfinie. L'utilisateur n'ayant de schéma pour l'aider à formuler sa question, celle-ci pourra donc être assez évasive ou incomplète. Nous développons dans la deuxième partie de cette thèse une structure qui permet la réécriture d'une requête incomplète dans une forme plus classique
Book Synopsis MODELES DE COUT POUR L'OPTIMISATION DE REQUETES OBJET by : JEAN-ROBERT.. GRUSER
Download or read book MODELES DE COUT POUR L'OPTIMISATION DE REQUETES OBJET written by JEAN-ROBERT.. GRUSER and published by . This book was released on 1996 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: DANS CETTE THESE NOUS ABORDONS LE PROBLEME DE L'OPTIMISATION DE REQUETES DANS LES SYSTEMES DE GESTION DE BASES DE DONNEES ORIENTEES OBJET. NOUS NOUS INTERESSONS PLUS PARTICULIEREMENT A LA TRANSFORMATION DES REQUETES EN CODE EXECUTABLE, ET A L'ESTIMATION DE LEUR COUT. LES BASES DE DONNEES ORIENTEES OBJET SONT DES SYSTEMES ISSUS DES LANGAGES DE PROGRAMMATION OBJET. L'OPTIMISATION DE REQUETES DANS CE CONTEXTE FAIT FACE A DE NOMBREUX PROBLEMES : L'ESPACE DE RECHERCHE EST TRES GRAND, LE MODELE DE PLACEMENT DES OBJETS EST EXTREMEMENT FLEXIBLE, LE MODELE D'EXECUTION EST TRES PUISSANT. DANS CETTE THESE, NOUS PROPOSONS UN SYTEME COMPLET D'OPTIMISATION PHYSIQUE CAPABLE DE PRENDRE EN COMPTE LES CARACTERTIQUES DU MODELE OBJET. LA MAJORITE DES CONTRIBUTIONS DE LA THESE ONT ETE IMPLANTEES DANS UN ENVIRONNEMENT POUR L'OPTIMISATION DE REQUETES OBJET : LE PROTOTYPE FLORA. DANS LE CADRE DE CE PROTOTYPE, NOUS NOUS AVONS ETUDIE LES DIFFERENTS PRINCIPES D'OPTIMISATION DYNAMIQUE. CETTE THESE PRESENTE, TOUT D'ABORD, UN MODELE DE PLACEMENT TRES GENERAL FACILEMENT ADAPTABLE AUX SYSTEMES EXISTANTS. LE PROGRAMMEUR UTILISE LE SCHEMA DE LA BASE POUR SPECIFIER LE PLACEMENT DES OBJETS. LE SYSTEME EST CAPABLE D'EN DEDUIRE LES STRUCTURES PHYSIQUES DE STOCKAGE ET LEURS STATISTIQUES. L'OPTIMISEUR REECRIT LES REQUETES POUR EN AMELIORER LES PERFORMANCES, EN UTILISANT CES STRUCTURES PHYSIQUES. NOUS AVONS AUSSI DEFINI UN MODELE D'EXECUTION OBJET BASE SUR LE MODELE RELATIONNEL ET LES LANGAGES DE PROGRAMMATION OBJET. NOUS PRESENTONS AUSSI UN NOUVEAU TYPE D'EXPRESSIONS DE CHEMIN : LES EXPRESSIONS DE CHEMIN FILTREES. LEUR ETUDE A FAIT L'OBJET DE MULTIPLES EXPERIENCES SUR LE SYSTEME O2 EN UTILISANT LE BANC DE TEST OO7. DE LA DEFINITION DE CES DEUX MODELES, NOUS EN DEDUISONS LE COMPOSANT MAJEUR D'UN OPTIMISATEUR PHYSIQUE : LE MODELE DE COUT. CE MODELE SERT A CHOISIR LA MEILLEURE FACON D'EXECUTER LA REQUETE. NOUS AVONS CONSTRUIT TROIS NIVEAUX DE FORMULES DE COUT ADAPTES A CHACUNE DES PHASES DU PROCESSUS D'OPTIMISATION. LE MODELE DE COUT A LA PARTICULARITE DE PRENDRE EN COMPTE LA GRANDE VARIETE DES CARACTERISTIQUES DU MODELE OBJET. NOUS AVONS VALIDE CE MODELE GRACE A DE NOMBREUSES EXPERIENCES EFFECTUEES SUR DES SYSTEMES DE GESTION DE BASES DE DONNEES OBJET DU COMMERCE.
Book Synopsis L'OPTIMISATION DE REQUETES DANS LES BASES DE DONNEES INTEROPERABLES by : VERONIQUE.. L'HELGUEN SMAHI
Download or read book L'OPTIMISATION DE REQUETES DANS LES BASES DE DONNEES INTEROPERABLES written by VERONIQUE.. L'HELGUEN SMAHI and published by . This book was released on 1997 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE ABORDE LE PROBLEME DE L'OPTIMISATION DE REQUETES DANS LES SYSTEMES DE BASES DE DONNEES INTEROPERABLES. CES SYSTEMES SONT APPARUS POUR PERMETTRE A DES APPLICATIONS DE COMMUNIQUER ENTRE ELLES DES INFORMATIONS INITIALEMENT HETEROGENES TOUT EN DEGRADANT LE MOINS POSSIBLE LEURS PERFORMANCES. C'EST POURQUOI L'OPTIMISATION DE REQUETES JOUE UN ROLE PRIMORDIAL. CETTE THESE DEFINIT UNE APPROCHE GLOBALE DE L'OPTIMISATION. DES REGLES DE REECRITURE SONT PROPOSEES POUR LES DIFFERENTES ETAPES DU TRAITEMENT D'UNE REQUETE GLOBALE. ELLES PRENNENT EN COMPTE LES MECANISMES D'INTEGRATION DES DONNEES AINSI QUE L'ARCHITECTURE DES SYSTEMES. DES REGLES BASEES SUR UN MECANISME DE CACHE MEMOIRE AU NIVEAU GLOBAL SONT AUSSI DEFINIES. ELLES PERMETTENT D'EVITER DES ACCES DISTANTS ET RAPPROCHE LE COMPORTEMENT D'UNE BASE DE DONNEES INTEROPERABLE DE CELUI D'UN SYSTEME CENTRALISE. CETTE ETUDE A ABOUTI A LA REALISATION D'UN MODULE D'OPTIMISATION DANS LE CADRE DU PROJET ESPRIT IRO-DB.
Book Synopsis Masters Abstracts International by :
Download or read book Masters Abstracts International written by and published by . This book was released on 1996 with total page 1000 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ingénierie du transport et des services de mobilité avancés by : HAMMADI Slim
Download or read book Ingénierie du transport et des services de mobilité avancés written by HAMMADI Slim and published by Lavoisier. This book was released on 2012-06-07 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le choix du mode de déplacement (voiture privée, transport en commun, vélo, marche) est souvent contraint par son accessibilité, son coût ou la qualité du service proposé. Or, à ce jour, la voiture reste le moyen de transport privilégié. Dans le cadre de la mobilité durable, le rôle de l'information des voyageurs devient crucial. Il est nécessaire de promouvoir l'utilisation rationnelle et pertinente du meilleur mode de transport pour un déplacement donné. Cette information multimodale, qui met en avant l'offre de mobilité sur un territoire donné, fait souvent défaut ou est difficilement disponible. Des projets ont ainsi été initiés qui, à l'instar du CISIT en Nord Pas de Calais, tentent de concrétiser des idées novatrices alliant l'intelligence aux transports. Ingénierie du transport et des services de mobilité avancés présente un état de l'art de l'ensemble des techniques, approches et méthodes pour la spécification, la conception, l'optimisation et la mise en oeuvre des services de mobilité avancés.
Book Synopsis Adaptive Stream Mining by : Albert Bifet
Download or read book Adaptive Stream Mining written by Albert Bifet and published by IOS Press. This book was released on 2010 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a significant contribution to the subject of mining time-changing data streams and addresses the design of learning algorithms for this purpose. It introduces new contributions on several different aspects of the problem, identifying research opportunities and increasing the scope for applications. It also includes an in-depth study of stream mining and a theoretical analysis of proposed methods and algorithms. The first section is concerned with the use of an adaptive sliding window algorithm (ADWIN). Since this has rigorous performance guarantees, using it in place of counters or accumulators, it offers the possibility of extending such guarantees to learning and mining algorithms not initially designed for drifting data. Testing with several methods, including Naïve Bayes, clustering, decision trees and ensemble methods, is discussed as well. The second part of the book describes a formal study of connected acyclic graphs, or 'trees', from the point of view of closure-based mining, presenting efficient algorithms for subtree testing and for mining ordered and unordered frequent closed trees. Lastly, a general methodology to identify closed patterns in a data stream is outlined. This is applied to develop an incremental method, a sliding-window based method, and a method that mines closed trees adaptively from data streams. These are used to introduce classification methods for tree data streams.
Download or read book Boolean Functions written by Yves Crama and published by Cambridge University Press. This book was released on 2011-05-16 with total page 711 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by prominent experts in the field, this monograph provides the first comprehensive, unified presentation of the structural, algorithmic and applied aspects of the theory of Boolean functions. The book focuses on algebraic representations of Boolean functions, especially disjunctive and conjunctive normal form representations. This framework looks at the fundamental elements of the theory (Boolean equations and satisfiability problems, prime implicants and associated short representations, dualization), an in-depth study of special classes of Boolean functions (quadratic, Horn, shellable, regular, threshold, read-once functions and their characterization by functional equations) and two fruitful generalizations of the concept of Boolean functions (partially defined functions and pseudo-Boolean functions). Several topics are presented here in book form for the first time. Because of the depth and breadth and its emphasis on algorithms and applications, this monograph will have special appeal for researchers and graduate students in discrete mathematics, operations research, computer science, engineering and economics.
Book Synopsis Technique Et Science Informatiques by :
Download or read book Technique Et Science Informatiques written by and published by . This book was released on 1988 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Innovative Computing Technology by : Pit Pichappan
Download or read book Innovative Computing Technology written by Pit Pichappan and published by Springer Science & Business Media. This book was released on 2012-01-18 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the proceedings of the First International Conference on Innovative Computing Technology, INCT 2011, held in Tehran, Iran, in December 2011. The 40 revised papers included in this book were carefully reviewed and selected from 121 submissions. The contributions are organized in topical sections on software; Web services and service architecture; computational intelligence; data modeling; multimedia and image segmentation; natural language processing; networks; cluster computing; and discrete systems.
Book Synopsis Concurrency Control and Recovery in Database Systems by : Philip A. Bernstein
Download or read book Concurrency Control and Recovery in Database Systems written by Philip A. Bernstein and published by Addison Wesley Publishing Company. This book was released on 1987 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Information Retrieval by : Fabio Crestani
Download or read book Advances in Information Retrieval written by Fabio Crestani and published by Springer. This book was released on 2003-07-31 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: The annual colloquium on information retrieval research provides an opportunity for both new and established researchers to present papers describing work in progress or ?nal results. This colloquium was established by the BCS IRSG(B- tish Computer Society Information Retrieval Specialist Group), and named the Annual Colloquium on Information Retrieval Research. Recently, the location of the colloquium has alternated between the United Kingdom and continental Europe. To re?ect the growing European orientation of the event, the colloquium was renamed “European Annual Colloquium on Information Retrieval Research” from 2001. Since the inception of the colloquium in 1979 the event has been hosted in the city of Glasgow on four separate occasions. However, this was the ?rst time that the organization of the colloquium had been jointly undertaken by three separate computer and information science departments; an indication of the collaborative nature and diversity of IR research within the universities of the West of Scotland. The organizers of ECIR 2002 saw a sharp increase in the number of go- quality submissions in answer to the call for papers over previous years and as such 52 submitted papers were each allocated 3 members of the program committee for double blind review of the manuscripts. A total of 23 papers were eventually selected for oral presentation at the colloquium in Glasgow which gave an acceptance rate of less than 45% and ensured a very high standard of the papers presented.
Book Synopsis Distributed Database Management Systems by : Saeed K. Rahimi
Download or read book Distributed Database Management Systems written by Saeed K. Rahimi and published by John Wiley & Sons. This book was released on 2015-02-13 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses issues related to managing data across a distributed database system. It is unique because it covers traditional database theory and current research, explaining the difficulties in providing a unified user interface and global data dictionary. The book gives implementers guidance on hiding discrepancies across systems and creating the illusion of a single repository for users. It also includes three sample frameworks—implemented using J2SE with JMS, J2EE, and Microsoft .Net—that readers can use to learn how to implement a distributed database management system. IT and development groups and computer sciences/software engineering graduates will find this guide invaluable.
Book Synopsis Persistent Object Systems by : David Maier
Download or read book Persistent Object Systems written by David Maier and published by Springer. This book was released on 1995-03-21 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains papers presented at the Sixth International Workshop on Persistent Object Systems, held in Tarascon, Provence, France, from 5-9 September 1994. As in previous years, the workshop addressed the issue of how to support the implementation of very long-lived systems. Among the specific topics discussed were: how to build, maintain, and operate large persistent applications; how to measure and analyse existing systems in order to improve the quality of persistent software engineering; and how to present and provide a full range of object store functions, such as concurrency, transactions, and recovery. The resulting volume will provide essential reading for researchers and postgraduate students in software engineering and programming languages.
Download or read book Data Analysis written by Wolfgang Gaul and published by Springer. This book was released on 2000-08-09 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Data Analysis" in the broadest sense is the general term for a field of activities of ever-increasing importance in a time called the information age. It covers new areas with such trendy labels as, e.g., data mining or web mining as well as traditional directions emphazising, e.g., classification or knowledge organization. Leading researchers in data analysis have contributed to this volume and delivered papers on aspects ranging from scientific modeling to practical application. They have devoted their latest contributions to a book edited to honor a colleague and friend, Hans-Hermann Bock, who has been active in this field for nearly thirty years.
Book Synopsis Information science, documentation by :
Download or read book Information science, documentation written by and published by . This book was released on 1987 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Basic Questions of Tort Law from a Comparative Perspective by : Helmut Koziol
Download or read book Basic Questions of Tort Law from a Comparative Perspective written by Helmut Koziol and published by . This book was released on 2015 with total page 867 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings written by and published by . This book was released on 1992 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
