Mysql 1040 Error
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Mysql Too Many Connections Flush
up vote 7 down vote If you are running out of connections like this, chances are excellent that you are not closing the connections that you have open. Review code that opens connections and ensure the connections are closed as soon as practical. Typically you want to make use of the using keyword around anything that implements IDisposable (including database connections) to ensure that such objects are disposed as soon as they leave the scope where they are needed. You can check the current number of active connections with this query: show processlist Reference: MySQL show status - active or total connections? share|improve this answer edited Jul 24 '15 at 16:35 answered Jan 15 '13 at 4:10 Eric J. 106k37221402 after all my codes at the end of the query I always close the connection... this error only appears when I open another computer or my program –kelvzy Jan 15 '13 at 4:18 but does it actually get closed? exceptions can cause close to be skipped –Darren Kopp Jan 15 '13 at 4:20 yes. when we used 2-20 comput
12 Comments If you run a fairly busy and/or badly configured MySQL server, you may receive something like this when attempting to connect: XHTML # mysql ERROR 1040: Too many connections 12 #
Show Max Connections Mysql
mysqlERROR 1040: Too many connections MySQL is telling you that it is handling the mysql max_connections maximum connections that you have configured it to handle. By default, MySQL will handle 100 connections simultaneously. This is very similar to mysql current connections the situation when Apache reaches the MaxClients setting. You won't even be able to connect to MySQL to find out what is causing the connections to be used up, so you will be forced to http://stackoverflow.com/questions/14331032/mysql-error-1040-too-many-connection restart the MySQL daemon to troubleshoot the issue. What causes MySQL to run out of connections? Here's a list of reasons that may cause MySQL to run out of available connections, listed in order of what you should check: Bad MySQL configuration Verify that you have set MySQL's buffers and caches to appropriate levels for the type of data you're storing and the types of queries that you are running. One quick https://major.io/2008/06/24/mysql-error-1040-too-many-connections/ way to check this information is via MySQLTuner. The script will tell you how well your server is performing along with the corrections you should make. Running the script only takes a few moments and it doesn't require a DBA to decipher the results. Data storage techniques Remember that MySQL works best when moving vertically, not horizontally. If you have a table with 20 columns, breaking it into two tables with 10 columns each will improve performance. Even if you need to join the two tables together to get your data, it will still perform at a higher level. Also, use the right data types for the right data. If you're storing an integer only, don't use a CHAR or VARCHAR data type. If your integer will be small, then use something like a TINYINT or SMALLINT rather than INT. This means MySQL will use less memory, pull less data from the disk, and have higher performing joins. Slow queries These are generally pretty easy to fix. If you have queries that don't use indexes, or if queries run slowly with indexes in place, you need to rethink how you're pulling your data. Should your data be split into multiple tables? Are you pulling more data than you need? Keep these
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 https://dbiers.me/mysql-too-many-connections/ or even on a 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 http://www.mysqldba.co.uk/articles/diagnosing-too-many-connections-errors 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 too many ~]# service mysql restart Shutting down MySQL....... [ 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 too many connections Server (GPL) Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. 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... 1 Finding Large Files in Linux August 20, 2012 0 Recover data from old RAID-1 Drive "linux_raid_member" File System February 7, 2014 6 Setup Grafana, InfluxDB, and collectd on CentOS 7.x April 5, 2016 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
some point you will encounter the error message "Too many connections" - given that the MySQL database server has three different connection limits, it's important to know which limit you've hit, and what you can do about it. Connections may fail with the "Too many connections" message for three reasons: The server has too many open connections already. A MySQL server can only handle a specific number of open connections before refusing to allow any more, and this limit is shared amongst all users of the server. It's usually set quite high, although it's easily possible for someone to effectively DoS a MySQL server by making lots of connections (but this can be prevented - see below) Your user account has a limited number of connections allowed per hour - any further connections within that hour would be rejected. This is set on a per-user basis. Your user account has a limited number of allowable open connections - any further connections would be rejected. This is set on a per-user basis. It's always important to read the error message you get returned on the connection attempt, as in most cases this will pinpoint the exact reason for failure. If your account has a maximum number of connections limit (scenario #3), the error would be: ERROR 1226 (42000): User 'mysqldba' has exceeded the 'max_user_connections' resource (current value: 1) Where 'mysqldba' would be your username, and the 'current value' is the maximum number of open connections allowed from this user. In this case, you need to reduce the number of database connections you're making (persistent or pooled connections may help, as might using a singleton pattern for your database connections) or speak to the DBA in charge of that server and ask that your per-user connection limit is raised. If your account has a maximum number of connections per hour limit (scenario #2), the error would be: ERROR 1226 (42000): User 'mysqldba' has exceeded the 'max_connections_per_hour' resource (current value: 1) Where, once again, 'mysqldba' would be your username, and the 'current value' is the maximum number of connections per hour a