{"id":7545,"date":"2019-08-21T14:04:37","date_gmt":"2019-08-21T13:04:37","guid":{"rendered":"http:\/\/blog.capdata.fr\/?p=7545"},"modified":"2019-09-13T10:34:43","modified_gmt":"2019-09-13T09:34:43","slug":"mysql-performance-schema-mais-ou-sont-passes-les-compteurs-com_","status":"publish","type":"post","link":"https:\/\/blog.capdata.fr\/index.php\/mysql-performance-schema-mais-ou-sont-passes-les-compteurs-com_\/","title":{"rendered":"MySQL & Performance Schema : mais o\u00f9 sont pass\u00e9s les compteurs Com_% ??"},"content":{"rendered":"\"twitter\"<\/a>\"linkedin\"<\/a>\"mail\"<\/a>

\"\"<\/p>\n

Si vous avez migr\u00e9 plus ou moins r\u00e9cemment de version de MySQL vers 5.7 ou 8.0, vous ne l’avez peut \u00eatre pas encore remarqu\u00e9, mais il y a eu quelques petits changements au niveau des variables de statut. Outre le fait de les avoir d\u00e9plac\u00e9 d’information_schema<\/i> vers performance_schema<\/i> ou le sch\u00e9ma sys<\/i> \u00e0 partir de la 5.7.9, en plus un certain nombre d’entre elles auront disparu:<\/p>\n

– Avant la version 5.7:<\/p>\n

\r\nmysql> select version() ;\r\n+-----------------------+\r\n| version()             |\r\n+-----------------------+\r\n| 5.6.17-1~dotdeb.1-log |\r\n+-----------------------+\r\n\r\nmysql> select count(1) from information_schema.global_status ;\r\n+----------+\r\n| count(1) |\r\n+----------+\r\n|      341 |\r\n+----------+\r\n\r\n<\/pre>\n
– \u00e0 partir de la version 5.7 :<\/p>\n
\r\nmysql> select version() ;\r\n+--------------+\r\n| version()    |\r\n+--------------+\r\n| 5.7.10-3-log |\r\n+--------------+\r\n\r\nmysql> select count(1) from performance_schema.global_status ;\r\n+----------+\r\n| count(1) |\r\n+----------+\r\n|      231 |\r\n+----------+\r\n\r\n<\/pre>\n
C’est particuli\u00e8rement flagrant pour les compteurs orient\u00e9s Commands<\/i>, ou Com_%<\/i>… <\/p>\n
– avant 5.7:<\/p>\n
mysql> select count(1) from information_schema.global_status \r\n    -> where VARIABLE_NAME like 'Com_%' ;\r\n+----------+\r\n| count(1) |\r\n+----------+\r\n|      142 |\r\n+----------+\r\n<\/pre>\n
– en 5.7+:<\/p>\n
mysql>  select count(1) from performance_schema.global_status\r\n    -> where VARIABLE_NAME like 'Com_%' ;\r\n+----------+\r\n| count(1) |\r\n+----------+\r\n|        1 |\r\n+----------+\r\n\r\nmysql> select count(1) from sys.metrics \r\n    -> where Variable_name like 'Com_%' ;\r\n+----------+\r\n| count(1) |\r\n+----------+\r\n|        5 |\r\n+----------+\r\n\r\n<\/pre>\n
Quand m\u00eame… D’o\u00f9 la question \u00e9ponyme. <\/p>\n
Alors o\u00f9 sont-ils pass\u00e9s ?<\/h2>\n
En 2016, Peter Zaitsev <\/a>lui-m\u00eame remonte cette bizarrerie dans le bug request #81632<\/a>, pour que finalement Oracle ne r\u00e9ponde que la localisation de ces compteurs Com_%<\/i> \u00e0 logiquement \u00e9volu\u00e9 vers les events de Performance Schema.<\/p>\n
Dans la doc <\/a>\u00e0 partir de la version 5.7+:<\/p>\n
“The Performance Schema does not collect statistics for Com_xxx status variables in the status variable tables. To obtain global and per-session statement execution counts, use the events_statements_summary_global_by_event_name and events_statements_summary_by_thread_by_event_name tables, respectively.”<\/i><\/p>\n
Nous \u00e9tions donc pr\u00e9venus.<\/p>\n
Par exemple si l’on veut retrouver l’\u00e9quivalent des compteurs types Com_Select, Com_Update, Com_Delete, Com_Insert, Com_Insert_Select<\/i> on ira chercher dans les vues de P_S de cette mani\u00e8re:<\/p>\n
\r\nmysql> SELECT EVENT_NAME, COUNT_STAR\r\n    -> FROM performance_schema.events_statements_summary_global_by_event_name\r\n    -> WHERE EVENT_NAME in\r\n    -> ('statement\/sql\/select','statement\/sql\/update','statement\/sql\/delete',\r\n    -> 'statement\/sql\/insert','statement\/sql\/insert_select') ;\r\n+-----------------------------+------------+\r\n| EVENT_NAME                  | COUNT_STAR |\r\n+-----------------------------+------------+\r\n| statement\/sql\/select        |  340039338 |\r\n| statement\/sql\/update        |   13467671 |\r\n| statement\/sql\/insert        |    1715801 |\r\n| statement\/sql\/insert_select |    7680967 |\r\n| statement\/sql\/delete        |   19016156 |\r\n+-----------------------------+------------+\r\n<\/pre>\n
Evidemment comme avant il faudra les sampler pour avoir une valeur par minute, une moyenne par seconde, etc… Plus possible d’utiliser pt-mext <\/a> ou autres outils de l’\u00e9poque de Maatkit<\/a> pour pouvoir faire le job, donc \u00e0 vous de trouver la m\u00e9thode de rollover qui convient le mieux. Pour l’agent AllDB <\/a>MySQL par exemple, nous avons choisi de ne pas utiliser d’objet relationnel pour faire le sampling pour minimiser l’impact potentiel sur les syst\u00e8mes de production (binlogs, r\u00e9plications, etc…). <\/p>\n
A bient\u00f4t !<\/p>\n
~David<\/p>\n\"twitter\"<\/a>\"linkedin\"<\/a>\"mail\"<\/a>","protected":false},"excerpt":{"rendered":"
Si vous avez migr\u00e9 plus ou moins r\u00e9cemment de version de MySQL vers 5.7 ou 8.0, vous ne l’avez peut \u00eatre pas encore remarqu\u00e9, mais il y a eu quelques petits changements au niveau des variables de statut. Outre le… Continuer la lecture →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":7723,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[324,221,325],"class_list":["post-7545","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mysql","tag-monitoring","tag-performance","tag-performance_schema"],"yoast_head":"\nMySQL & Performance Schema : mais o\u00f9 sont pass\u00e9s les compteurs Com_% ?? - 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-performance-schema-mais-ou-sont-passes-les-compteurs-com_\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MySQL & Performance Schema : mais o\u00f9 sont pass\u00e9s les compteurs Com_% ?? - Capdata TECH BLOG\" \/>\n<meta property=\"og:description\" content=\"Si vous avez migr\u00e9 plus ou moins r\u00e9cemment de version de MySQL vers 5.7 ou 8.0, vous ne l’avez peut \u00eatre pas encore remarqu\u00e9, mais il y a eu quelques petits changements au niveau des variables de statut. 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