How To Solve Too Many Connections Error In Mysql
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Users Badges Unanswered Ask Question _ Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others http://dev.mysql.com/doc/en/too-many-connections.html in the community. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top How to resolve too many connections and fatal error in mysql running on vps up vote 9 down vote favorite 7 I am running an http://dba.stackexchange.com/questions/20479/how-to-resolve-too-many-connections-and-fatal-error-in-mysql-running-on-vps application PHPlist on my linode server, simultaneously running 12 PHP scripts, each of which opens a MySQL connection. Now when I access PHPlist it often shows this error: Fatal Error: Sorry, the server is currently too busy, please try again later. When I am trying to access phpMyAdmin, it shows me a #1040 error. Output of my PHP scripts which run through cron jobs shows: PHP Warning: mysqli_connect(): (HY000/1040): Too many connections I am using the LAMP stack on the server with phpMyAdmin; the top output in terminal shows mysqld using 100-130% CPU. When I am trying to troubleshoot this problem I got some clues: Increase max_connection variable : I am using 200 (100 by default) Open table cache: 512 (400 by default) There are lots of variables to set but I can't determine what specific ones, I am getting some reference from: too many connections and http://dev.mysql.com/doc/refman/5.5/en/table-cache.html But according to my usage how to increase memory and what is the maximum memory difficult for me. On my server I am using around 12 PHP scripts, PHPlist
David · October 12, 2012 MySQL too many connections. Of course this simply means there are too many connections to the MySQL database. This can happen on a very busy site or even on a https://dbiers.me/mysql-too-many-connections/ site with few visitors that contains poor coding that doesn't drop connections. To fix it, you can go one of two ways. Through SSH using MySQL commands or by adding a directive to the global configuration file (/etc/my.cnf). ------------- For editing the configuration file, simply add the below directive to the configuration file. /etc/my.cnf max_connections=XXX Then restart MySQL services: [01:50:26] [root@localhost ~]# service mysql restart Shutting down MySQL....... [ too many OK ] Starting MySQL. [ OK ] ------------- To change it via command line, you will need to be root and log into MySQL and use the command "set global max_connections=XXX": [01:50:37] [root@localhost ~]# mysql Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 62 Server version: 5.1.65-cll MySQL Community Server (GPL) Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. too many connections Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> set global max_connections=5000; Query OK, 0 rows affected (0.00 sec) Tags: Bashconnectionsdatabasesmysql You may also like... 0 SSH Tunneling on Linux August 10, 2012 0 Remove empty lines from files (sed) January 14, 2014 0 Using MySQLDump to Back up and Restore Databases March 2, 2013 2 Responses Comments2 Pingbacks0 Sean Dempsey says: January 27, 2016 at 10:38 AM I found the default value set here (124) to be surprisingly low. However, is there any danger is changing the value to a number as high as 5000 (per your example above)? What are the pros/cons involved? Reply David says: January 27, 2016 at 11:23 AM It depends on the traffic you're receiving. Around 1000 connections is the maximum before you want to start load balancing and clustering. Setting it too high will result in the server crashing after it runs out of memory. If you have some pages or parts of your website or application that are not closing connections, you should review the programming and reasoning behind why those conn