{"id":1138,"date":"2019-03-20T15:31:54","date_gmt":"2019-03-20T12:31:54","guid":{"rendered":"https:\/\/galaxydata.ru\/community\/?p=1138"},"modified":"2025-07-22T20:43:35","modified_gmt":"2025-07-22T17:43:35","slug":"calculate-table_open_cache-mysql","status":"publish","type":"post","link":"https:\/\/galaxydata.ru\/community\/calculate-table_open_cache-mysql-1138","title":{"rendered":"Calculate table_open_cache MySQL"},"content":{"rendered":"<p>1. Find current value of open_tables and opened_tables<\/p>\n<pre class=\"lang:sh decode:true\">mysql&gt; show global status like 'open%';\r\n+--------------------------+---------+\r\n| Variable_name | Value |\r\n+--------------------------+---------+\r\n| Open_files | 1583 |\r\n| Open_streams | 0 |\r\n| Open_table_definitions | 1400 |\r\n| Open_tables | 2000 |\r\n| Opened_files | 2619222 |\r\n| Opened_table_definitions | 110583 |\r\n| Opened_tables | 482099 |\r\n+--------------------------+---------+\r\n7 rows in set (0.00 sec)<\/pre>\n<p>2. Find out Table cache hit rate<\/p>\n<pre class=\"lang:sh decode:true\">Table cache hit rate = table_open_cache*100\/Opened_tables. \r\n= 2000*100\/482099\r\n= 0.41%<\/pre>\n<p>In general it should be more than 50%. So you need to increase value of table_open_cache, though there are lots of reasons to have a high value of Opened_tables. Like FLUSH TABLES will close all open tables and reopen it which significantly increases Opened_tables value.<\/p>\n<p>At this stage you are almost sure table_open_cache system variable is not tuned properly.<\/p>\n<p><strong>Now you have to optimize MySQL table_open_cache and find out perfect value for this. To find tuned value of table_open_cache value follow the steps:<\/strong><\/p>\n<p><strong>1. Find out total tables of your database<\/strong><\/p>\n<pre class=\"lang:sh decode:true\">mysql&gt; SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE='BASE TABLE';\r\n+----------+\r\n| COUNT(*) |\r\n+----------+\r\n| 211 |\r\n+----------+\r\n1 row in set (0.05 sec)\r\nFind threads currently connected to your database.\r\n\r\nmysql&gt; show global status like '%Threads_connected%';\r\n+-------------------+-------+\r\n| Variable_name | Value |\r\n+-------------------+-------+\r\n| Threads_connected | 6 |\r\n+-------------------+-------+\r\n1 row in set (0.00 sec)<\/pre>\n<p>It would be best if you take threads connected at busiest time of your database or take several times at different time and make an average.<\/p>\n<p><strong>3. Calculate the tune value of table_open_cache and set it<\/strong><\/p>\n<pre class=\"lang:sh decode:true\">Table_open_cache = total_tables*Threads_connected\r\n= 211*6\r\n= 633<\/pre>\n<p>As all the threads (user) are not generally access all tables. I think you should set 50% of the value calculated. Because too big value of this variable has some other side effects. So the formula becomes<\/p>\n<pre class=\"lang:sh decode:true \">Table_open_cache = total_tables*Threads_connected*.50<\/pre>\n<p><strong>4. Along with table_open_cache you should also tune open_files_limit system variable.<\/strong><\/p>\n<p>In general it is 2x of table_open_cache.<\/p>\n<pre class=\"lang:sh decode:true\">open_files_limit= Table_open_cache*2<\/pre>\n<p>open_files_limit is not a dynamic variable. So you should set it in my.cnf file and restart MySQL.<\/p>\n<p>*Make sure that your operating system can cope with the number of open file descriptors required by the table_open_cache setting.<\/p>\n<p>Go to your Mysql configuration file (in linux it is \/etc\/my.cnf) and set the table_open_cache and open_files_limit<\/p>\n<pre class=\"lang:sh decode:true\">nano \/etc\/my.cnf<\/pre>\n<p>add<\/p>\n<pre class=\"lang:sh decode:true \">table_open_cache=633\r\nopen_files_limit=65535<\/pre>\n<p><strong>5.\u00a0LimitNOFILE<\/strong><\/p>\n<pre class=\"lang:sh decode:true\">nano \/etc\/systemd\/system\/multi-user.target.wants\/mysql.service<\/pre>\n<p><strong>Add line Ubuntu\/Debian<\/strong><\/p>\n<pre class=\"lang:sh decode:true\"># MySQL systemd service file\r\n\r\n[Unit]\r\nDescription=MySQL Community Server\r\nAfter=network.target\r\n\r\n[Install]\r\nWantedBy=multi-user.target\r\n\r\n[Service]\r\nUser=mysql\r\nGroup=mysql\r\nPermissionsStartOnly=true\r\nExecStartPre=\/usr\/share\/mysql\/mysql-systemd-start pre\r\nExecStart=\/usr\/sbin\/mysqld\r\nExecStartPost=\/usr\/share\/mysql\/mysql-systemd-start post\r\nTimeoutSec=600\r\nRestart=on-failure\r\nRuntimeDirectory=mysqld\r\nRuntimeDirectoryMode=755\r\n<strong>LimitNOFILE=65536<\/strong><\/pre>\n<p>OR<\/p>\n<p>Centos\/RHEL\/Fedora<\/p>\n<pre class=\"lang:sh decode:true\">nano \/etc\/systemd\/system\/multi-user.target.wants\/mysql.service<\/pre>\n<p>add line<\/p>\n<pre class=\"lang:sh decode:true\">LimitNOFILE=65536<\/pre>\n<p>Reload and Restart<\/p>\n<pre class=\"lang:sh decode:true\">systemctl daemon-reload \r\nservice mysql restart<\/pre>\n<p><strong>6. Restart the MySQL ( In Linux it is like)<\/strong><\/p>\n<pre class=\"lang:sh decode:true \">systemctl daemon-reload\r\nsystemctl restart mysql\r\n<\/pre>\n<p>or old Ubuntu 14.04\/ Debian 7\/ CentOS 62020<\/p>\n<pre class=\"lang:sh decode:true\">\/etc\/init.d\/mysqld restart\r\nor\r\n\/etc\/init.d\/mysql restart<\/pre>\n<p>The database I have taken has 211 tables so the value of table_open_cache is little big. For your case it may be significantly small.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. Find current value of open_tables and opened_tables mysql&gt; show global status like &#8216;open%&#8217;; +&#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;+ | Open_files | 1583 | | Open_streams | 0&hellip; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,6],"tags":[22],"class_list":["post-1138","post","type-post","status-publish","format-standard","hentry","category-database","category-linux","tag-mysql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.4 (Yoast SEO v25.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Calculate table_open_cache MySQL - GalaxyData Community<\/title>\n<meta name=\"description\" content=\"Determine the optimal `table_open_cache` value for your MySQL server. 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