{"id":757,"date":"2022-07-06T06:35:00","date_gmt":"2022-07-06T04:35:00","guid":{"rendered":"https:\/\/expert-only.com\/prep\/?p=757"},"modified":"2022-07-08T09:50:41","modified_gmt":"2022-07-08T07:50:41","slug":"differences-cubes-rolap-holap-molap","status":"publish","type":"post","link":"https:\/\/expert-only.com\/fr\/ssas\/differences-cubes-rolap-holap-molap\/","title":{"rendered":"Diff\u00e9rences entre les cubes ROLAP HOLAP et MOLAP"},"content":{"rendered":"\n<p>Quelles sont les diff\u00e9rences entre les cubes SSAS OLAP, de type ROLAP, MOLAP ou encore HOLAP ? Ils permettent la mise en place de syst\u00e8mes d&rsquo;analyse de donn\u00e9es. Appel\u00e9es aussi bases de donn\u00e9es multidimensionnelles, elles permettent une approche diff\u00e9rente de celles des bases de donn\u00e9es dites relationnelles ou OLTP. Ces syst\u00e8mes d\u00e9cisionnels permettent une vision approfondie, agr\u00e9g\u00e9e et rapide des donn\u00e9es. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-difference-entre-un-cube-ssas-rolap-molap-et-holap\">Diff\u00e9rence entre un cube SSAS ROLAP, MOLAP et HOLAP<\/h2>\n\n\n\n<p>Mais en pratique, qu&rsquo;est-ce qu&rsquo;une base de donn\u00e9es ou un cube OLAP ? Quelle est la diff\u00e9rence entre un cube ROLAP, MOLAP et HOLAP ?<\/p>\n\n\n\n<p>L&rsquo;abr\u00e9viation OLAP signifie On Line Analytical Processing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-les-cubes-molap-pour-multidimensional-on-line-analytical-processing\">Les cubes MOLAP pour Multidimensional On Line Analytical Processing<\/h3>\n\n\n\n<p>Premi\u00e8rement, le MOLAP, c\u2019est de l\u2019OLAP Multidimensionnel. Le syst\u00e8me stocke les donn\u00e9es dans un cube qui est une base de donn\u00e9es multidimensionnelle.<\/p>\n\n\n\n<p>De cette fa\u00e7on, le concept de relationnel dispara\u00eet. Tous les croisements envisageables et possibles sont pr\u00e9calcul\u00e9s. C&rsquo;est l\u2019objectif principal de ce type de base de donn\u00e9es. <\/p>\n\n\n\n<p>En effet ce pr\u00e9-calcul permet la restitution des donn\u00e9es de fa\u00e7on instantan\u00e9e. Les donn\u00e9es stock\u00e9es apr\u00e8s le calcul permettent une \u00e9conomie de temps consid\u00e9rable pendant la restitution.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><b>Les inconv\u00e9nients des cubes SSAS MOLAP<\/b><\/h4>\n\n\n\n<p>Le co\u00fbt est important, en effet, le MOLAP n\u00e9cessite souvent des licences pour les bases multidimensionnelles et des co\u00fbts pour le d\u00e9veloppement des CUBES.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><b>L\u2019avantage des cubes MOLAP<\/b><\/h4>\n\n\n\n<p>Le temps de r\u00e9ponse est extr\u00eamement rapide car la totalit\u00e9 des donn\u00e9es sont stock\u00e9es dans un cube, c&rsquo;est \u00e0 dire que les combinaisons sont pr\u00e9calcul\u00e9es durant le traitement du cube.&nbsp;<\/p>\n\n\n\n<p>Les bases de donn\u00e9es multidimensionnelles poss\u00e8dent leur propre langage permettant de faire des requ\u00eates, appel\u00e9 le <a href=\"https:\/\/expert-only.com\/ssas\/definition-ssas\/\"><strong>MDX<\/strong><\/a>, qui est l\u2019\u00e9quivalent du <a href=\"https:\/\/expert-only.com\/cours-sql-server-gratuit\/\"><strong>SQL<\/strong><\/a>&nbsp;utilis\u00e9 pour les bases de donn\u00e9es relationnelles.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-tutoriels-et-exemples-sql-server-et-microsoft-it wp-block-embed-tutoriels-et-exemples-sql-server-et-microsoft-it\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"Kb3Tuf8zpA\"><a href=\"https:\/\/expert-only.com\/fr\/concepts\/dax-signifie-data-analysis-expressions\/\">DAX signifie Data Analysis Expressions<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"\u00ab\u00a0DAX signifie Data Analysis Expressions\u00a0\u00bb &#8212; Tutoriels SQL et IT\" src=\"https:\/\/expert-only.com\/fr\/concepts\/dax-signifie-data-analysis-expressions\/embed\/#?secret=YEY5UbwWu4#?secret=Kb3Tuf8zpA\" data-secret=\"Kb3Tuf8zpA\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-rolap-est-l-abreviation-de-relational-on-line-analytical-processing\">ROLAP est l&rsquo;abr\u00e9viation de Relational On Line Analytical Processing<\/h3>\n\n\n\n<p>Deuxi\u00e8mement, le ROLAP, c\u2019est de l\u2019OLAP relationnel.&nbsp;L\u2019obtention des donn\u00e9es se fait via des tables relationnelles et des jointures qui vont avec celles-ci. <\/p>\n\n\n\n<p>Donc, la requ\u00eate cr\u00e9\u00e9e sera relativement complexe, selon la granularit\u00e9 du projet, et aura donc un cout de maintenance cons\u00e9quent. <\/p>\n\n\n\n<p>Comme le r\u00e9sultat n\u2019est pas stock\u00e9, \u00e0 chaque consultation, la requ\u00eate devra \u00eatre relanc\u00e9e \u00e0 chaque consultation la requ\u00eate devra \u00eatre relanc\u00e9e. Toutefois, les syst\u00e8mes ROLAP propose souvent des options de caches pour limiter le nombre de requ\u00eates sur les bases de l&rsquo;<strong><a href=\"https:\/\/expert-only.com\/concepts\/entrepot-de-donnees-ou-data-warehouse\/\">entrep\u00f4t de donn\u00e9es<\/a><\/strong>.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><b>Quelques inconv\u00e9nients de la m\u00e9thode ROLAP<\/b><\/h4>\n\n\n\n<p>Les temps de r\u00e9ponse sont cons\u00e9quents \u00e9tant donn\u00e9 que les requ\u00eates lisent les r\u00e9sultats directement depuis des tables relationnelles. Les bases sont donc utilis\u00e9es \u00e0 chaque ex\u00e9cution du rapport, sauf si le cache est activ\u00e9. De plus les requ\u00eates sont plus complexes, car l&rsquo;agr\u00e9gation et les formules se font \u00e0 la vol\u00e9e.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><b>Les avantage de la m\u00e9thode ROLAP<\/b><\/h4>\n\n\n\n<p>Le co\u00fbt est relativement faible, en effet, cette m\u00e9thode utilise des ressources d\u00e9j\u00e0 disponibles comme un serveur SQL. De plus les donn\u00e9es sont toujours disponibles sans traitement pour pr\u00e9calculer et agr\u00e9ger les donn\u00e9es.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-tutoriels-et-exemples-sql-server-et-microsoft-it wp-block-embed-tutoriels-et-exemples-sql-server-et-microsoft-it\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/expert-only.com\/concepts\/modelisation-decisionnelle-de-ralph-kimball\/\n<\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-les-cubes-ssas-en-mode-holap-pour-hybrid-online-analytical-processing\">Les cubes SSAS en mode HOLAP pour Hybrid Online Analytical Processing<\/h3>\n\n\n\n<p>Troisi\u00e8mement, L\u2019HOLAP est un m\u00e9lange du ROLAP et du MOLAP, les cubes HOLAP sont donc Hybrides. On se sert du MOLAP lorsque l\u2019on veut acc\u00e9der aux donn\u00e9es agr\u00e9g\u00e9es. Pour atteindre un niveau de d\u00e9tail plus important, utiliser le ROLAP.<\/p>\n\n\n\n<p>Par exemple, les donn\u00e9es sont stock\u00e9es et accessible via un Cube multidimensionnel, mais on fait \u00e9galement de la restitution via un outil de Reporting comme <a href=\"https:\/\/expert-only.com\/ssrs\/creer-requete-sql-dynamique-dataset-ssrs\/\">SSRS<\/a> par exemple.<\/p>\n\n\n\n<p>L\u2019utilisateur peut avoir acc\u00e8s \u00e0 un rapport fournissant les donn\u00e9es issues d&rsquo;un cube. Et aussi \u00e0 un autre rapport d\u00e9taill\u00e9, dit op\u00e9rationnel contenant les donn\u00e9es en provenance de tables, cette fois relationnelles.<\/p>\n\n\n\n<p>C&rsquo;est le concept du <strong>drill through<\/strong>, il permet de voir le d\u00e9tail le plus fin depuis des tables sources du cube. C&rsquo;est l&rsquo;\u00e9quivalent du double-clic dans un tableau crois\u00e9 dynamique Excel.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><b>Les inconv\u00e9nients de la m\u00e9thode HOLAP<\/b><\/h4>\n\n\n\n<p>La m\u00e9thode Hybride OLAP est difficile \u00e0 utiliser dans le cas d&rsquo;une complexit\u00e9 \u00e9lev\u00e9e de rapports. Ou encore s&rsquo;ils font appel \u00e0 trop de croisements de donn\u00e9es.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><b>Les avantages de la m\u00e9thode HOLAP<\/b><\/h4>\n\n\n\n<p>Possible avec un investissement financier moindre que la m\u00e9thode MOLAP car la partie d\u00e9veloppement est moins importante. De plus le temps de r\u00e9ponse est relativement performant.&nbsp;<\/p>\n\n\n\n<p>La plupart des rapports ne n\u00e9cessitent pas obligatoirement un nombre important de croisement de donn\u00e9es.<\/p>\n\n\n\n<p>Cet article pr\u00e9sente les&nbsp;diff\u00e9rences fondamentales entre les cubes ROLAP, MOLAP et HOLAP multidimensionnels. Les besoins techniques et surtout fonctionnels d\u00e9terminent le choix du type de cube.<\/p>\n\n\n\n<p>Ces tutoriels <a href=\"https:\/\/docs.microsoft.com\/en-us\/analysis-services\/multidimensional-tutorial\/multidimensional-modeling-adventure-works-tutorial?view=asallproducts-allversions\">SSAS<\/a> sur le site officiel de Microsoft (en Anglais) permettent d&rsquo;apprendre la mod\u00e9lisation multidimensionnelle avec des cas pratiques et simples.<\/p>\n\n\n\n<p>Les exercices utilisent la base de donn\u00e9es d&rsquo;exemple AdventureWorksDW, \u00e0 t\u00e9l\u00e9charger et installer au pr\u00e9alable.<\/p>\n\n\n\n<p>Cet article pr\u00e9sente les Cube SSAS ROLAP MOLAP et HOLAP, notamment dans les options disponibles avec Microsoft SSAS.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-tutoriels-et-exemples-sql-server-et-microsoft-it wp-block-embed-tutoriels-et-exemples-sql-server-et-microsoft-it\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/expert-only.com\/concepts\/definition-xmla-xml-for-analysis\/\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<div class=\"mh-excerpt\"><p>Quelles sont les diff\u00e9rences entre les cubes SSAS OLAP, de type ROLAP, MOLAP ou encore HOLAP ? Ils permettent la mise en place de syst\u00e8mes d&rsquo;analyse de donn\u00e9es. Appel\u00e9es aussi bases de donn\u00e9es multidimensionnelles, elles permettent une approche diff\u00e9rente <a class=\"mh-excerpt-more\" href=\"https:\/\/expert-only.com\/fr\/ssas\/differences-cubes-rolap-holap-molap\/\" title=\"Diff\u00e9rences entre les cubes ROLAP HOLAP et MOLAP\">&#8230;<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":{"0":"post-757","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-ssas"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.7 (Yoast SEO v26.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Diff\u00e9rences entre les cubes ROLAP HOLAP et MOLAP - SSAS<\/title>\n<meta name=\"description\" content=\"Diff\u00e9rences entre les cubes\u00a0SSAS ou bases multidimensionnelles ROLAP, MOLAP et HOLAP. 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