{"id":293,"date":"2010-01-06T17:04:34","date_gmt":"2010-01-06T16:04:34","guid":{"rendered":"http:\/\/blog.capdata.fr\/?p=293"},"modified":"2022-11-21T17:00:51","modified_gmt":"2022-11-21T16:00:51","slug":"mysql-et-les-tables-temporaires-internes","status":"publish","type":"post","link":"https:\/\/blog.capdata.fr\/index.php\/mysql-et-les-tables-temporaires-internes\/","title":{"rendered":"MySQL et les tables temporaires internes"},"content":{"rendered":"<a class=\"synved-social-button synved-social-button-share synved-social-size-24 synved-social-resolution-single synved-social-provider-twitter nolightbox\" data-provider=\"twitter\" target=\"_blank\" rel=\"nofollow\" title=\"Share on Twitter\" href=\"https:\/\/twitter.com\/intent\/tweet?url=https%3A%2F%2Fblog.capdata.fr%2Findex.php%2Fwp-json%2Fwp%2Fv2%2Fposts%2F293&#038;text=Article%20sur%20le%20blog%20de%20la%20Capdata%20Tech%20Team%20%3A%20\" style=\"font-size: 0px;width:24px;height:24px;margin:0;margin-bottom:5px;margin-right:5px\"><img loading=\"lazy\" decoding=\"async\" alt=\"twitter\" title=\"Share on Twitter\" class=\"synved-share-image synved-social-image synved-social-image-share\" width=\"24\" height=\"24\" style=\"display: inline;width:24px;height:24px;margin: 0;padding: 0;border: none;box-shadow: none\" src=\"https:\/\/blog.capdata.fr\/wp-content\/plugins\/social-media-feather\/synved-social\/image\/social\/regular\/48x48\/twitter.png\" \/><\/a><a class=\"synved-social-button synved-social-button-share synved-social-size-24 synved-social-resolution-single synved-social-provider-linkedin nolightbox\" data-provider=\"linkedin\" target=\"_blank\" rel=\"nofollow\" title=\"Share on Linkedin\" href=\"https:\/\/www.linkedin.com\/shareArticle?mini=true&#038;url=https%3A%2F%2Fblog.capdata.fr%2Findex.php%2Fwp-json%2Fwp%2Fv2%2Fposts%2F293&#038;title=MySQL%20et%20les%20tables%20temporaires%20internes\" style=\"font-size: 0px;width:24px;height:24px;margin:0;margin-bottom:5px;margin-right:5px\"><img loading=\"lazy\" decoding=\"async\" alt=\"linkedin\" title=\"Share on Linkedin\" class=\"synved-share-image synved-social-image synved-social-image-share\" width=\"24\" height=\"24\" style=\"display: inline;width:24px;height:24px;margin: 0;padding: 0;border: none;box-shadow: none\" src=\"https:\/\/blog.capdata.fr\/wp-content\/plugins\/social-media-feather\/synved-social\/image\/social\/regular\/48x48\/linkedin.png\" \/><\/a><a class=\"synved-social-button synved-social-button-share synved-social-size-24 synved-social-resolution-single synved-social-provider-mail nolightbox\" data-provider=\"mail\" rel=\"nofollow\" title=\"Share by email\" href=\"mailto:?subject=MySQL%20et%20les%20tables%20temporaires%20internes&#038;body=Article%20sur%20le%20blog%20de%20la%20Capdata%20Tech%20Team%20%3A%20:%20https%3A%2F%2Fblog.capdata.fr%2Findex.php%2Fwp-json%2Fwp%2Fv2%2Fposts%2F293\" style=\"font-size: 0px;width:24px;height:24px;margin:0;margin-bottom:5px\"><img loading=\"lazy\" decoding=\"async\" alt=\"mail\" title=\"Share by email\" class=\"synved-share-image synved-social-image synved-social-image-share\" width=\"24\" height=\"24\" style=\"display: inline;width:24px;height:24px;margin: 0;padding: 0;border: none;box-shadow: none\" src=\"https:\/\/blog.capdata.fr\/wp-content\/plugins\/social-media-feather\/synved-social\/image\/social\/regular\/48x48\/mail.png\" \/><\/a><p>MySQL cr\u00e9\u00e9 des tables temporaires automatiquement lors de certaines s\u00e9lections de donn\u00e9es, en particulier lors de l&#8217;utilisation des clauses <em>ORDER BY<\/em> ou<em> GROUP BY<\/em>.<\/p>\n<p>Le d\u00e9tail des cas de cr\u00e9ation de tables temporaires est disponible dans la documentation MySQL :<\/p>\n<ul>\n<li><a href=\"https:\/\/dev.mysql.com\/doc\/refman\/5.1\/en\/internal-temporary-tables.html\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/dev.mysql.com\/doc\/refman\/5.1\/en\/internal-temporary-tables.html<\/a><\/li>\n<\/ul>\n<p>Ces tables temporaires sont cr\u00e9\u00e9es en m\u00e9moire par d\u00e9faut, dans la limite de la taille d\u00e9finie par le param\u00e8tre <strong><em>tmp_table_size<\/em> <\/strong>[taille par d\u00e9faut d\u00e9pendante de l&#8217;OS]. Au del\u00e0 de cette limite, la table temporaire est cr\u00e9\u00e9e sur disque. Attention toutefois, si la valeur du param\u00e8tre <em>max_heap_table_size<\/em> [16M par d\u00e9faut] est inf\u00e9rieure \u00e0 celle de <em>tmp_table_size<\/em>, alors les tables temporaires en m\u00e9moire seront limit\u00e9es \u00e0 <em>max_heap_table_size<\/em>. Pour simplifier les choses, positionnez les deux param\u00e8tres \u00e0 la m\u00eame valeur.<\/p>\n<p>Il est \u00e9videmment plus performant de provoquer le maximum de cr\u00e9ation en m\u00e9moire en positionnant la valeur du param\u00e8tre<em> tmp_table_size<\/em> \u00e0 une taille relativement importante (16M \u00e0 32M).<br \/>\nAttention toutefois au d\u00e9bordement m\u00e9moire, en effet, cette taille peut potentiellement \u00eatre consomm\u00e9e par chaque thread connect\u00e9 !<\/p>\n<p>La colonne <em>Extra <\/em>de la commande <em>EXPLAIN <\/em>pour une requ\u00eate de type <em>SELECT <\/em>permet d&#8217;obtenir une information sur la cr\u00e9ation d&#8217;une \u00e9ventuelle table temporaire.<br \/>\nDans ce cas (utilisation d&#8217;un<em> GROUP BY<\/em>), une table temporaire sera cr\u00e9\u00e9e :<\/p>\n<p style=\"text-align: center;\">*************************** 1. row ***************************<br \/>\nid: 1<br \/>\nselect_type: SIMPLE<br \/>\ntable: t_evenement<br \/>\ntype: ALL<br \/>\npossible_keys: NULL<br \/>\nkey: NULL<br \/>\nkey_len: NULL<br \/>\nref: NULL<br \/>\nrows: 14988<br \/>\nExtra: <strong>Using temporary<\/strong>; Using filesort<\/p>\n<p>En revanche, cette commande ne permet pas de savoir si la table temporaire est cr\u00e9\u00e9e sur disque ou en m\u00e9moire, pour cela, il faudra s&#8217;appuyer sur les compteurs MySQL \u00e9voqu\u00e9s dans la suite de l&#8217;article.<\/p>\n<p>Le graphe suivant pr\u00e9sente un \u00e9tat des tables temporaires cr\u00e9\u00e9es en m\u00e9moire et sur disque pour notre instance de production\u00a0 :<\/p>\n<div id=\"attachment_378\" style=\"width: 549px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.capdata.fr\/support-DBA-oracle-sqlserver-mysql-sybase.htm\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-378\" class=\"size-full wp-image-378  \" src=\"https:\/\/blog.capdata.fr\/wp-content\/uploads\/2010\/01\/temporay_tables.jpg\" alt=\"Tables temporaires\" width=\"539\" height=\"376\" srcset=\"https:\/\/blog.capdata.fr\/wp-content\/uploads\/2010\/01\/temporay_tables.jpg 539w, https:\/\/blog.capdata.fr\/wp-content\/uploads\/2010\/01\/temporay_tables-300x209.jpg 300w, https:\/\/blog.capdata.fr\/wp-content\/uploads\/2010\/01\/temporay_tables-250x175.jpg 250w\" sizes=\"auto, (max-width: 539px) 100vw, 539px\" \/><\/a><p id=\"caption-attachment-378\" class=\"wp-caption-text\">Tables temporaires MySQL<\/p><\/div>\n<p>Les compteurs MySQL utilis\u00e9s pour relever ces valeurs sont<code> <em>Created_tmp_table<\/em> et <em>Created_tmp_disk_tables<\/em>.<\/code> Il n&#8217;est malheureusement pas possible de connaitre la taille consomm\u00e9e en m\u00e9moire ou sur disque par ces tables temporaires.<\/p>\n<p>Ici, la quasi totalit\u00e9 des tables temporaires est cr\u00e9\u00e9e sur disque. La taille maximum d&#8217;une table temporaire en m\u00e9moire est pourtant positionn\u00e9e \u00e0 une valeur relativement importante (48M).<\/p>\n<p><strong>Le fait d&#8217;augmenter la valeur du <em>tmp_table_size<\/em> ne changera rien dans ce cas ! Explications :<\/strong><\/p>\n<p>MySQL utilise le moteur de stockage <a href=\"https:\/\/dev.mysql.com\/doc\/refman\/5.1\/en\/memory-storage-engine.html\" target=\"_blank\" rel=\"noopener noreferrer\"><em>MEMORY <\/em><\/a>pour la cr\u00e9ation des tables temporaires internes. Ce moteur se comporte quasiment comme <em>MyISAM<\/em>, cependant, une\u00a0 contrainte\u00a0 de ce moteur vient perturber le fonctionnement des tables temporaires internes : <strong>Il n&#8217;est pas possible d&#8217;utiliser des colonnes de type BLOB ou TEXT pour les tables <em>MEMORY<\/em>.<\/strong><\/p>\n<p>De ce fait, si MySQL doit cr\u00e9er une table temporaire pour un ordre <em>SELECT <\/em>contenant ces types de colonne, elle sera automatiquement cr\u00e9\u00e9e sur disque.<\/p>\n<p>Deux possibilit\u00e9s s&#8217;offrent \u00e0 vous dans ce cas :<\/p>\n<ul>\n<li>Limiter l&#8217;utilisation des colonnes de type BLOB ou TEXT<\/li>\n<li>Monter un syst\u00e8me de fichier m\u00e9moire pour le stockage des tables temporaires interne MySQL<\/li>\n<\/ul>\n<p>[ C\u00e9dric P ]<\/p>\n<a class=\"synved-social-button synved-social-button-share synved-social-size-24 synved-social-resolution-single synved-social-provider-twitter nolightbox\" data-provider=\"twitter\" target=\"_blank\" rel=\"nofollow\" title=\"Share on Twitter\" href=\"https:\/\/twitter.com\/intent\/tweet?url=https%3A%2F%2Fblog.capdata.fr%2Findex.php%2Fwp-json%2Fwp%2Fv2%2Fposts%2F293&#038;text=Article%20sur%20le%20blog%20de%20la%20Capdata%20Tech%20Team%20%3A%20\" style=\"font-size: 0px;width:24px;height:24px;margin:0;margin-bottom:5px;margin-right:5px\"><img loading=\"lazy\" decoding=\"async\" alt=\"twitter\" title=\"Share on Twitter\" class=\"synved-share-image synved-social-image synved-social-image-share\" width=\"24\" height=\"24\" style=\"display: inline;width:24px;height:24px;margin: 0;padding: 0;border: none;box-shadow: none\" src=\"https:\/\/blog.capdata.fr\/wp-content\/plugins\/social-media-feather\/synved-social\/image\/social\/regular\/48x48\/twitter.png\" \/><\/a><a class=\"synved-social-button synved-social-button-share synved-social-size-24 synved-social-resolution-single synved-social-provider-linkedin nolightbox\" data-provider=\"linkedin\" target=\"_blank\" rel=\"nofollow\" title=\"Share on Linkedin\" href=\"https:\/\/www.linkedin.com\/shareArticle?mini=true&#038;url=https%3A%2F%2Fblog.capdata.fr%2Findex.php%2Fwp-json%2Fwp%2Fv2%2Fposts%2F293&#038;title=MySQL%20et%20les%20tables%20temporaires%20internes\" style=\"font-size: 0px;width:24px;height:24px;margin:0;margin-bottom:5px;margin-right:5px\"><img loading=\"lazy\" decoding=\"async\" alt=\"linkedin\" title=\"Share on Linkedin\" class=\"synved-share-image synved-social-image synved-social-image-share\" width=\"24\" height=\"24\" style=\"display: inline;width:24px;height:24px;margin: 0;padding: 0;border: none;box-shadow: none\" src=\"https:\/\/blog.capdata.fr\/wp-content\/plugins\/social-media-feather\/synved-social\/image\/social\/regular\/48x48\/linkedin.png\" \/><\/a><a class=\"synved-social-button synved-social-button-share synved-social-size-24 synved-social-resolution-single synved-social-provider-mail nolightbox\" data-provider=\"mail\" rel=\"nofollow\" title=\"Share by email\" href=\"mailto:?subject=MySQL%20et%20les%20tables%20temporaires%20internes&#038;body=Article%20sur%20le%20blog%20de%20la%20Capdata%20Tech%20Team%20%3A%20:%20https%3A%2F%2Fblog.capdata.fr%2Findex.php%2Fwp-json%2Fwp%2Fv2%2Fposts%2F293\" style=\"font-size: 0px;width:24px;height:24px;margin:0;margin-bottom:5px\"><img loading=\"lazy\" decoding=\"async\" alt=\"mail\" title=\"Share by email\" class=\"synved-share-image synved-social-image synved-social-image-share\" width=\"24\" height=\"24\" style=\"display: inline;width:24px;height:24px;margin: 0;padding: 0;border: none;box-shadow: none\" src=\"https:\/\/blog.capdata.fr\/wp-content\/plugins\/social-media-feather\/synved-social\/image\/social\/regular\/48x48\/mail.png\" \/><\/a>","protected":false},"excerpt":{"rendered":"<p>MySQL cr\u00e9\u00e9 des tables temporaires automatiquement lors de certaines s\u00e9lections de donn\u00e9es, en particulier lors de l&#8217;utilisation des clauses ORDER BY ou GROUP BY. Le d\u00e9tail des cas de cr\u00e9ation de tables temporaires est disponible dans la documentation MySQL :&hellip; <a href=\"https:\/\/blog.capdata.fr\/index.php\/mysql-et-les-tables-temporaires-internes\/\" class=\"more-link\">Continuer la lecture <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":14,"featured_media":7970,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[59,58,51,46,44,60,45],"class_list":["post-293","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mysql","tag-blob","tag-engine","tag-max_heap_table_size","tag-tables-temporaires","tag-temporary-tables","tag-text","tag-tmp_table_size"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>MySQL et les tables temporaires internes - Capdata TECH BLOG<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.capdata.fr\/index.php\/mysql-et-les-tables-temporaires-internes\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MySQL et les tables temporaires internes - Capdata TECH BLOG\" \/>\n<meta property=\"og:description\" content=\"MySQL cr\u00e9\u00e9 des tables temporaires automatiquement lors de certaines s\u00e9lections de donn\u00e9es, en particulier lors de l&#8217;utilisation des clauses ORDER BY ou GROUP BY. 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Le d\u00e9tail des cas de cr\u00e9ation de tables temporaires est disponible dans la documentation MySQL :&hellip; Continuer la lecture &rarr;","og_url":"https:\/\/blog.capdata.fr\/index.php\/mysql-et-les-tables-temporaires-internes\/","og_site_name":"Capdata TECH BLOG","article_published_time":"2010-01-06T16:04:34+00:00","article_modified_time":"2022-11-21T16:00:51+00:00","og_image":[{"width":280,"height":180,"url":"https:\/\/blog.capdata.fr\/wp-content\/uploads\/2010\/01\/t\u00e9l\u00e9chargement-1.jpg","type":"image\/jpeg"}],"author":"Benjamin VESAN","twitter_card":"summary_large_image","twitter_misc":{"\u00c9crit par":"Benjamin VESAN","Dur\u00e9e de lecture estim\u00e9e":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/blog.capdata.fr\/index.php\/mysql-et-les-tables-temporaires-internes\/#article","isPartOf":{"@id":"https:\/\/blog.capdata.fr\/index.php\/mysql-et-les-tables-temporaires-internes\/"},"author":{"name":"Benjamin VESAN","@id":"https:\/\/blog.capdata.fr\/#\/schema\/person\/ae56d1d3d5680d95ccc2c927e44bdc3e"},"headline":"MySQL et les tables temporaires internes","datePublished":"2010-01-06T16:04:34+00:00","dateModified":"2022-11-21T16:00:51+00:00","mainEntityOfPage":{"@id":"https:\/\/blog.capdata.fr\/index.php\/mysql-et-les-tables-temporaires-internes\/"},"wordCount":537,"commentCount":0,"publisher":{"@id":"https:\/\/blog.capdata.fr\/#organization"},"keywords":["blob","engine","max_heap_table_size","tables temporaires","temporary tables","text","tmp_table_size"],"articleSection":["MySQL"],"inLanguage":"fr-FR","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/blog.capdata.fr\/index.php\/mysql-et-les-tables-temporaires-internes\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/blog.capdata.fr\/index.php\/mysql-et-les-tables-temporaires-internes\/","url":"https:\/\/blog.capdata.fr\/index.php\/mysql-et-les-tables-temporaires-internes\/","name":"MySQL et les tables temporaires internes - 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