{"id":9526,"date":"2022-08-05T07:34:00","date_gmt":"2022-08-05T05:34:00","guid":{"rendered":"https:\/\/expert-only.com\/?p=9526"},"modified":"2023-05-04T11:12:50","modified_gmt":"2023-05-04T09:12:50","slug":"reorganiser-un-index-sql-server","status":"publish","type":"post","link":"https:\/\/expert-only.com\/fr\/t-sql\/reorganiser-un-index-sql-server\/","title":{"rendered":"R\u00e9organiser un index SQL Server"},"content":{"rendered":"\n<h4 class=\"wp-block-heading has-text-align-center\"><strong><em>Script pour v\u00e9rifier puis r\u00e9organiser un index fragment\u00e9 dans une base de donn\u00e9es SQL Server. <\/em><\/strong><\/h4>\n\n\n\n<p>Une op\u00e9ration de maintenance permet de d\u00e9fragmenter le niveau inf\u00e9rieur des index en r\u00e9ordonnant physiquement les pages, de gauche \u00e0 droite. Voici un script pour <mark>r\u00e9organiser<\/mark> un index SQL Server. L&rsquo;op\u00e9ration de r\u00e9organisation compacte \u00e9galement les pages de l&rsquo;index. Pour mieux comprendre, imaginez un livre de recettes dont les pages ne sont plus ordonn\u00e9es. Vous devez alors r\u00e9organiser les pages afin d&rsquo;atteindre rapidement la page souhait\u00e9e.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-comment-reorganiser-un-index-sql-server-fragmente\">Comment r\u00e9organiser un index SQL Server fragment\u00e9 ?<\/h2>\n\n\n\n<p>Premi\u00e8rement, consid\u00e9rons l&rsquo;index dans ce <strong><a href=\"https:\/\/expert-only.com\/transact-sql\/creer-un-index-sql-server\/\">tutoriel avec des exemples pour cr\u00e9er un index SQL Server non cluster<\/a><\/strong> sur une table des ventes. L&rsquo;index utilise les principaux filtres sur la table des ventes \u00e0 partir de la dimension temporelle, c&rsquo;est-\u00e0-dire les colonnes ann\u00e9e et mois. Apr\u00e8s beaucoup d&rsquo;insertion et de suppression, les donn\u00e9es ne sont plus dans un ordre logique croissant sur les disques. C&rsquo;est  \u00e0 dire que les index sont fragment\u00e9s. <\/p>\n\n\n\n<p>Pour r\u00e9organiser les donn\u00e9es d&rsquo;un index et am\u00e9liorer les performances il faut r\u00e9organiser les indexs r\u00e9guli\u00e8rement. Ou encore lorsque la fragmentation d\u00e9passe un pourcentage. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00e9rifier le pourcentage de fragmentation sur toutes les tables SQL Server<\/h2>\n\n\n\n<p>Deuxi\u00e8mement, cette requ\u00eate permet d&rsquo;afficher toutes les statistiques pour toutes les tables et indexe d&rsquo;une base MSSQL. La requ\u00eate n&rsquo;affiche pas seulement les donn\u00e9es mais elle les stocke dans une table en dur pour permettre de filtrer et trier les donn\u00e9es avec la deuxi\u00e8me requ\u00eate.<\/p>\n\n\n\n<p>Consid\u00e9rer la colonne <strong>avg_fragmentation_in_percent<\/strong>, c&rsquo;est \u00e0 dire la fragmentation moyenne en pourcentage affiche donc l&rsquo;information pour chaque index.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"mssql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">SELECT\t* \nINTO\tdbo.dm_db_index_physical_stats_TEMP\nFROM\tsys.dm_db_index_physical_stats (NULL, NULL, NULL, NULL, NULL);\nGO\n\nSELECT\t\t* \nFROM\t\tdm_db_index_physical_stats_TEMP\nORDER BY\tavg_fragmentation_in_percent DESC;<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">R\u00e9organiser un index SQL Server pour optimiser les performances<\/h2>\n\n\n\n<p>A partir de quel pourcentage faut-il construire ou organiser \u00e0 nouveau les index? C&rsquo;est une bonne pratique SQL de r\u00e9organiser les index si le <a href=\"https:\/\/www.sqlshack.com\/how-to-identify-and-resolve-sql-server-index-fragmentation\/\" target=\"_blank\" rel=\"noreferrer noopener\">pourcentage de fragmentation<\/a> se situe entre 15 et 30%. Par contre, au-dessus de 30%, construire \u00e0 nouveau l&rsquo;index avec la commande REBUILD.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"mssql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">ALTER INDEX indexYearMonth \n\tON [dbo].[SALES] REORGANIZE;<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Diff\u00e9rence entre reconstruction et r\u00e9organisation des index SQL Server<\/h2>\n\n\n\n<p>La reconstruction d&rsquo;un index reconstruit les donn\u00e9es et la structure de l&rsquo;index. C&rsquo;est un processus visant \u00e0 r\u00e9cup\u00e9rer l&rsquo;espace inutilis\u00e9 dans l&rsquo;index. En effet, la reconstruction d&rsquo;un index SQL consiste \u00e0 recr\u00e9er un index en lisant toutes les pages de donn\u00e9es de la table. Puis les trier en fonction de leurs valeurs cl\u00e9s.<\/p>\n\n\n\n<p>Tandis que la r\u00e9organisation d&rsquo;un index change l&rsquo;ordre des pages de l&rsquo;index sans le reconstruire. R\u00e9organiser un index est plus rapide que le reconstruire. La reconstruction mal effectu\u00e9e entra\u00eene une fragmentation. L&rsquo;op\u00e9ration consiste \u00e0 r\u00e9organiser les pages de niveau feuille afin d&rsquo;am\u00e9liorer l&rsquo;acc\u00e8s aux lignes d&rsquo;une table.<\/p>\n\n\n\n<p>La r\u00e9organisation d&rsquo;un index SQL peut \u00eatre utile si une fragmentation s&rsquo;est produite, ou si des modifications importantes ont \u00e9t\u00e9 apport\u00e9es \u00e0 la table qui affectent sa structure. Cet article montre comment r\u00e9organiser un index fragment\u00e9 avec un exemple simple. Pour aller plus loin, consulter la documentation de Microsoft sur les raisons de v\u00e9rifier la fragmentation de l&rsquo;index et comment reconstruire et r\u00e9organiser les index.<\/p>\n\n\n\n<p>Voici <strong><a href=\"https:\/\/expert-only.com\/fr\/t-sql\/creer-vue-sql-server-avec-script\/\">le premier tutoriel de la s\u00e9rie sur les vues avec un script pour cr\u00e9er une vue SQL Server<\/a><\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-tutoriels-sql-et-it wp-block-embed-tutoriels-sql-et-it\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"kBG6xAHks4\"><a href=\"https:\/\/expert-only.com\/fr\/t-sql\/creer-vue-sql-server-avec-script\/\">Cr\u00e9er une vue SQL Server avec un script<\/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\u00a0Cr\u00e9er une vue SQL Server avec un script\u00a0\u00bb &#8212; Tutoriels SQL et IT\" src=\"https:\/\/expert-only.com\/fr\/t-sql\/creer-vue-sql-server-avec-script\/embed\/#?secret=uwhBlps57c#?secret=kBG6xAHks4\" data-secret=\"kBG6xAHks4\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<div class=\"mh-excerpt\"><p>Script pour v\u00e9rifier puis r\u00e9organiser un index fragment\u00e9 dans une base de donn\u00e9es SQL Server. Une op\u00e9ration de maintenance permet de d\u00e9fragmenter le niveau inf\u00e9rieur des index en r\u00e9ordonnant physiquement les pages, de gauche \u00e0 droite. Voici un script <a class=\"mh-excerpt-more\" href=\"https:\/\/expert-only.com\/fr\/t-sql\/reorganiser-un-index-sql-server\/\" title=\"R\u00e9organiser un index SQL Server\">&#8230;<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":10797,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":{"0":"post-9526","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-t-sql"},"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>R\u00e9organiser un index SQL Server - T-SQL<\/title>\n<meta name=\"description\" content=\"R\u00e9organiser un index SQL Server et maintenir les performances des requ\u00eates sur les tables index\u00e9es avec la requ\u00eate INDEX REORGANIZE.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/expert-only.com\/fr\/t-sql\/reorganiser-un-index-sql-server\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"R\u00e9organiser un index SQL Server\" \/>\n<meta property=\"og:description\" content=\"R\u00e9organiser un index SQL Server et maintenir les performances des requ\u00eates sur les tables index\u00e9es avec la requ\u00eate INDEX REORGANIZE.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/expert-only.com\/fr\/t-sql\/reorganiser-un-index-sql-server\/\" \/>\n<meta property=\"og:site_name\" content=\"Tutoriels SQL et IT\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/ExpertOnlyCom\/\" \/>\n<meta property=\"article:published_time\" content=\"2022-08-05T05:34:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-05-04T09:12:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/expert-only.com\/wp-content\/uploads\/2022\/09\/one-hundred-64289A5CC0F_1920x1080.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"1080\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Expert-Only\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@expert_only\" \/>\n<meta name=\"twitter:site\" content=\"@expert_only\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Expert-Only\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/expert-only.com\/fr\/t-sql\/reorganiser-un-index-sql-server\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/expert-only.com\/fr\/t-sql\/reorganiser-un-index-sql-server\/\"},\"author\":{\"name\":\"Expert-Only\",\"@id\":\"https:\/\/expert-only.com\/fr\/#\/schema\/person\/406a9576b52944f018739a42046873ef\"},\"headline\":\"R\u00e9organiser un index SQL Server\",\"datePublished\":\"2022-08-05T05:34:00+00:00\",\"dateModified\":\"2023-05-04T09:12:50+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/expert-only.com\/fr\/t-sql\/reorganiser-un-index-sql-server\/\"},\"wordCount\":602,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/expert-only.com\/fr\/#organization\"},\"image\":{\"@id\":\"https:\/\/expert-only.com\/fr\/t-sql\/reorganiser-un-index-sql-server\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/expert-only.com\/wp-content\/uploads\/2022\/09\/one-hundred-64289A5CC0F_1920x1080.jpg\",\"articleSection\":[\"T-SQL\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/expert-only.com\/fr\/t-sql\/reorganiser-un-index-sql-server\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/expert-only.com\/fr\/t-sql\/reorganiser-un-index-sql-server\/\",\"url\":\"https:\/\/expert-only.com\/fr\/t-sql\/reorganiser-un-index-sql-server\/\",\"name\":\"R\u00e9organiser un index SQL Server - 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