mySQL Error 1040 Too Many Connection

Question

How to fix these   SQL Error 1040  Too Many Connection  even I try to put  max user connection 500   still  Too many connection

User · Answer

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?

User · Answer

Try this     open the terminal and type this command   sudo gedit  etc mysql my cnf  Paste the line in my cnf file  set-variable max connections 500

User · Answer

The issue noted clearly in https   dev mysql com doc refman 8 0 en too-many-connections html      If clients encounter Too many connections errors when attempting to   connect to the MySQL server  all available connections are in use by   other clients    I got resolved the issue after a few minutes  it seems that connection was been released by other clients  also I tried with restarting vs and workbench at same time

User · Answer

You have to change max connections to increase total permitted connections   And set max user connections back to default 0    no limit unless you need to limit this per user connections   MySQL Too many connections

User · Answer

To see how many connections are configured for your DB to use   select   max connections    To change it   set global max connections   200    To see how many are connected at the current time   show processlist    I also wrote this piece of software to help me create a nice spreadsheet of transactions over time so I can track down which queries are the problem

User · Answer

I was getting this error even though I had all my Connections wrapped in using statements   The thing I was overlooking is how long those connections were staying open   I was doing something like this   using  MySqlConnection conn   new MySqlConnection ConnectionString         conn Open        foreach var m in conn Query lt model gt  sql                    do something that takes a while  accesses disk or even open up other connections           Remember that connection will not close until everything in the loop is done and if the loop creates more connections  they can really start adding up   This is better   List lt model gt  models   null  using  MySqlConnection conn   new MySqlConnection ConnectionString         conn Open         models   conn Query lt model gt  sql  ToList       to list is needed here since once the connection is closed you can t step through an IEnumerable       foreach var m in models           do something that takes a while  accesses disk or even open up other connections     That way your connection is allowed to close and is released back to the thread pool before you go to do other things

User · Answer

you need check your all connection  Then try to close it one by one  it maybe caused by one of your connection  I have similar case  the root cause come from my monitoring server  So when I closed it  it works

User · Answer

Check if your current running application is still accessing your mysql and has consumed all the DB connections    So if you try to access mysql from workbench   you will get  too many connections  error   stop your current running web application which is holding all those db connections and then your issue will be solved

User · Answer

This issue occurs mostly when the maximum allowed concurrent connections to MySQL has exceeded  The max connections allowed is stored in the gloobal variable max connections  You can check it by show global variables like max connections  in MySQL You can fix it by the following steps  Step1  Login to MySQL and run this command  SET GLOBAL max connections   100  Now login to MySQL  the too many connection error fixed  This method does not require server restart  Step2  Using the above step1 you can resolve ths issue but max connections will roll back to its default value when mysql is restarted  In order to make the max connection value permanent  update the my cnf file  Stop the MySQL server   Service mysql stop Edit the configuration file my cnf  vi  etc mysql my cnf Find the variable max connections under mysqld section   mysql  max connections   300 Set into higher value and save the file  Start the server  Service mysql start Note  Before increasing the max connections variable value  make sure that  the server has adequate memory for new requests and connections  MySQL pre-allocate memory for each connections and de-allocate only when the connection get closed  When new connections are querying  system should have enough resources such memory  network and computation power to satisfy the user requests  Also  you should consider increasing the open tables limit in MySQL server to accommodate the additional request  And finally  it is very important to close the connections which are completed transaction on the server

User · Answer

MySQL  ERROR 1040  Too many connections  This basically tells that MySQL handles the maximum number of connections simultaneously and by default it handles 100 connections simultaneously    These following reasons cause MySQL to run out connections    Slow Queries Data Storage Techniques Bad MySQL configuration   I was able to overcome this issues by doing the followings   Open MySQL command line tool and type   show variables like  max connections     This will return you something like this    ----------------- -------    Variable name     Value    ----------------- -------    max connections   100      ----------------- -------    You can change the setting to e g  200 by issuing the following command without having to restart the MySQL server   set global max connections   200    Now when you restart MySQL the next time it will use this setting instead of the default   Keep in mind that increase of the number of connections will increase the amount of RAM required for MySQL to run

User · Answer

In your program you would have opened the connections and left open without closing it   I faced a same problem and finally identified   I added this code  after try catch   finally      try           rs close            p close            conn close          catch  SQLException e               TODO Auto-generated catch block         e printStackTrace

User · Answer

This error occurs  due to connection limit reaches the maximum limit  defined in the configuration file my cnf   In order to fix this error  login to MySQL as root user  Note  you can login as root  since  mysql will pre-allocate additional one connection for root user  and increase the max connections variable by using the following command   SET GLOBAL max connections   500    This change will be there  until next server restart  In order to make this change permanent  you have to modify in your configuration file  You can do this by   vi  etc my cnf   mysqld  max connections   500   This article has detailed step by step workaround to fix this error  Have a look at it  I hope it may help you  Thanks

User · Answer

It is worth knowing that if you run out of usable disc space on your server partition or drive  that this will also cause MySQL to return this error  If you re sure it s not the actual number of users connected then the next step is to check that you have free space on your MySQL server drive partition   Edit January 2019  This is true of MySQL 5 7 and 5 8   I do not know for versions above this

[mysql] mySQL Error 1040: Too Many Connection

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