{"id":292,"date":"2011-04-11T08:28:39","date_gmt":"2011-04-11T05:28:39","guid":{"rendered":"http:\/\/www.eklmn.org\/?p=292"},"modified":"2011-04-11T10:03:27","modified_gmt":"2011-04-11T07:03:27","slug":"vstroennyj-mexanizm-keshirovaniya-zaprosov-v-mysql","status":"publish","type":"post","link":"https:\/\/www.eklmn.org\/?p=292","title":{"rendered":"\u0412\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u044b\u0439 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c \u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0432 MySQL."},"content":{"rendered":"<p>MySQL \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u0442 \u0432\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u044b\u0439 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c \u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0439, \u043e\u0434\u043d\u0430\u043a\u043e \u043d\u0435 \u0432\u043a\u043b\u044e\u0447\u0435\u043d \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e. \u0412\u043e\u0442 \u0442\u0430\u043a\u0438\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u044b \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432 MySQL 5.0:<br \/>\nmysql&gt; show variables like &#8216;query_cache%&#8217;;<\/p>\n<pre>mysql&gt; show variables like 'query_cache%';\r\n+------------------------------+---------+\r\n| Variable_name                | Value   |\r\n+------------------------------+---------+\r\n| query_cache_limit            | 1048576 |\r\n| query_cache_min_res_unit     | 4096    |\r\n| query_cache_size             | 0       |\r\n| query_cache_type             | ON      |\r\n| query_cache_wlock_invalidate | OFF     |\r\n+------------------------------+---------+<\/pre>\n<p>\u0427\u0442\u043e\u0431\u044b \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u044c \u043a\u044d\u0448 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0438 \u0432\u044b\u0434\u0435\u043b\u0438\u0442\u044c \u043f\u043e\u0434 \u043d\u0435\u0433\u043e 32 \u043c\u0435\u0433\u0430\u0431\u0430\u0439\u0442\u0430 \u043f\u0430\u043c\u044f\u0442\u0438 \u043c\u043e\u0436\u043d\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0437\u0430\u043f\u0440\u043e\u0441 set @@global.query_cache_size=32*1024*1024; \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 \u0441\u0443\u043f\u0435\u0440\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f, \u0430 \u0447\u0442\u043e\u0431\u044b \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u044d\u0442\u0443 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0443 \u043f\u043e\u0441\u0442\u043e\u044f\u043d\u043d\u043e\u0439, \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u0432 my.cnf \u0432 \u043f\u043e\u0434\u0440\u0430\u0437\u0434\u0435\u043b [mysqld] \u0441\u0442\u0440\u043e\u0447\u043a\u0443 query_cache_size=32M. \u0412\u0442\u043e\u0440\u043e\u0439 \u043f\u043e\u043b\u0435\u0437\u043d\u044b\u0439 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 &#8211; query_cache_limit \u0437\u0430\u0434\u0430\u0435\u0442 \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u044b\u0439 \u043e\u0431\u044a\u0435\u043c \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0437\u0430\u043f\u0440\u043e\u0441\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043f\u043e\u043c\u0435\u0449\u0435\u043d \u0432 \u043a\u044d\u0448<\/p>\n<p>\u0422\u0435\u043a\u0443\u0449\u0435\u0435 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u043a\u044d\u0448\u0430<\/p>\n<p>\u041f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u043a\u044d\u0448\u0430 \u043c\u043e\u0436\u043d\u043e \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u0437\u0430\u043f\u0440\u043e\u0441\u0430:<br \/>\nmysql&gt; SHOW GLOBAL STATUS LIKE &#8216;Qcache%&#8217;;<\/p>\n<pre>+-------------------------+----------+\r\n| Variable_name           | Value    |\r\n+-------------------------+----------+\r\n| Qcache_free_blocks      | 973      |\r\n| Qcache_free_memory      | 14282000 |\r\n| Qcache_hits             | 3293750  |\r\n| Qcache_inserts          | 252819   |\r\n| Qcache_lowmem_prunes    | 0        |\r\n| Qcache_not_cached       | 66645    |\r\n| Qcache_queries_in_cache | 1342     |\r\n| Qcache_total_blocks     | 3709     |\r\n+-------------------------+----------+\r\n8 rows in set (0.00 sec)<\/pre>\n<p>\u0417\u0434\u0435\u0441\u044c:<\/p>\n<p>Qcache_free_memory &#8211; \u043e\u0431\u044a\u0435\u043c \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438, \u043e\u0442\u0432\u0435\u0434\u0435\u043d\u043d\u043e\u0439 \u043f\u043e\u0434 \u043a\u044d\u0448.<br \/>\nQcache_hits &#8211; \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432, \u043e\u0442\u0440\u0430\u0431\u043e\u0442\u0430\u043d\u043d\u044b\u0445 \u0438\u0437 \u043a\u044d\u0448\u0430.<br \/>\nQcache_inserts &#8211; \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0432\u0441\u0442\u0430\u0432\u043e\u043a \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0432 \u043a\u044d\u0448.<br \/>\nQcache_lowmem_prunes &#8211; \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0432\u044b\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0435\u043d\u0438\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 \u0438\u0437-\u0437\u0430 \u043d\u0430\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u043a\u044d\u0448\u0430.<br \/>\nQcache_not_cached &#8211; \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432, \u043d\u0435 \u043f\u043e\u0434\u043b\u0435\u0436\u0430\u0449\u0438\u0445 \u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044e.<br \/>\nQcache_queries_in_cache &#8211; \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432, \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0438\u0445\u0441\u044f \u0432 \u043a\u044d\u0448\u0435 \u0432 \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0435\u0435 \u0432\u0440\u0435\u043c\u044f.<\/p>\n<p><strong>\u041c\u0435\u0440\u043e\u0439 \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u0438 \u043a\u044d\u0448\u0430 \u043c\u043e\u0436\u0435\u0442 \u0441\u043b\u0443\u0436\u0438\u0442\u044c \u043e\u0442\u043d\u043e\u0448\u0435\u043d\u0438\u0435 Qcache_hits \/ (Qcache_inserts + Qcache_not_cached).<\/strong><br \/>\n25 069 \/ (11 196 + 916) = 2.06976552 (\u043a\u0430\u0436\u0434\u044b\u0439 \u0432\u0442\u043e\u0440\u043e\u0439 \u0437\u0430\u043f\u0440\u043e\u0441 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u0438\u0437 \u0431\u0430\u0437\u044b)<br \/>\n3 293 750 \/ (252 819 + 66 645) = 10.3102384 (\u043a\u0430\u0436\u0434\u044b\u0439 10 \u0437\u0430\u043f\u0440\u043e\u0441 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u0438\u0437 \u0431\u0430\u0437\u044b)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MySQL \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u0442 \u0432\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u044b\u0439 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c \u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0439, \u043e\u0434\u043d\u0430\u043a\u043e \u043d\u0435 \u0432\u043a\u043b\u044e\u0447\u0435\u043d \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e. \u0412\u043e\u0442 \u0442\u0430\u043a\u0438\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u044b \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432 MySQL 5.0: mysql&gt; show variables like &#8216;query_cache%&#8217;; mysql&gt; show variables like &#8216;query_cache%&#8217;; +&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;+&#8212;&#8212;&#8212;+ | Variable_name | Value | +&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;+&#8212;&#8212;&#8212;+ | query_cache_limit | 1048576 | | query_cache_min_res_unit | 4096 | | query_cache_size | 0 | | query_cache_type [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[],"class_list":["post-292","post","type-post","status-publish","format-standard","hentry","category-xosting"],"_links":{"self":[{"href":"https:\/\/www.eklmn.org\/index.php?rest_route=\/wp\/v2\/posts\/292","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.eklmn.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.eklmn.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.eklmn.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.eklmn.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=292"}],"version-history":[{"count":6,"href":"https:\/\/www.eklmn.org\/index.php?rest_route=\/wp\/v2\/posts\/292\/revisions"}],"predecessor-version":[{"id":294,"href":"https:\/\/www.eklmn.org\/index.php?rest_route=\/wp\/v2\/posts\/292\/revisions\/294"}],"wp:attachment":[{"href":"https:\/\/www.eklmn.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=292"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.eklmn.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=292"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.eklmn.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}