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Mysql Max_connections
Overflow the company Business Learn more about hiring developers or posting ads with us Database Administrators Questions Tags too many connections mysql java 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 https://dev.mysql.com/doc/refman/5.5/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 application http://dba.stackexchange.com/questions/20479/how-to-resolve-too-many-connections-and-fatal-error-in-mysql-running-on-vps 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 application for
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Connection Count To Avoid This Problem Gen If you don't have enough connections open to your MySQL server, your users will begin to receive a "Too many connections" error while trying to use your service. To fix this, you can increase the maximum number of connections to the database that are allowed, but there are some things to take into consideration before simply ramping up this number. Items to Consider Before you increase the connections limit, you will want to ensure that the machine on which the database is housed can handle the additional workload. The maximum number of connections that can be supported depends on the following variables: The availableRAM– The system will need to have enough RAM to handle the additional workload. Thethreadlibrary quality of the platform - This will vary based on the platform. For example, Windows can be limited by the Posix compatibility layer it uses (though the limit no longer applies to MySQL v5.5 and up). However, there remains memoray usage concerns depending on the architecture (x86 vs. x64) and how much memory can be consumed per application process. The required response time - Increasing the number could increase the amount of time to respond to request. This should be tested to ensure it meets your needs before going into production. The amount of RAM used per connection - Again, RAM is important, so you will need to know if the RAM used per connection will overload the system or not. The workload required for each connection - The workload will also factor in to what system resources are needed to handle the additional connections. Another issue to consider is that you may also need to increase the open files limit–This may be necessary so that enough handles are available. Checking the Connection Limit To see what the current connection limit is, you can run the following from the MySQL command line or from many of the available MySQL tools such asphpMyAdmin: The show variables command. This will display a nicely formatted result for you: Example result of the show variables command. Increasing the Connection Limit To increase the global number of connections