I have a problem with error 1040

October 01, 2020 by Owen Faunce

 

Sometimes your computer may return error code 1040. There can be several reasons for this error.

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When a client tries to connect to MySQL, it sometimes gets rejected and receives a Too Many Connections error message. This means that the maximum number of clients that can be connected to the server has been reached.

 

 

Understand How MySQL Handles Connections And Troubleshoot MySQL Error 1040 - Too Many Connections!

Interpretation "MySQL Error 1040 - Too Many Connections!" "?



When a client tries to connect to MySQL, it is sometimes refused and an error message is displayed indicating that there are “too many connections”. This means that the maximum number of clients that can be connected to the server has been reached. Either the client must wait for another client to disconnect, or the administrator must increase the maximum number of allowed connections.

The Requirement - Few Points Before For Work Or Fix MySQL Errors ">" Error

MySQL Error - Too Many Connections, How To Fix It?


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Recently, one of the clients (included in the fifthe-commerce company in the world) called us to see how elegant connection management is during peak hours. They have had problems in the past with "ERROR 1040: Too many connections" and this clearly explains that the maximum number of clients that can be connected to the server has been reached. Either the client must wait for another client to disconnect, or the administrator must increase the maximum number of allowed connections. Therefore, we wanted to do a detailed check of the integrity of the MySQL connection management and fix the Too Many Connections error ahead of time. Below we have explained how you can successfully reproduce this issue and recommended an update:


How do I fix too many connections error in MySQL?

Correct way to solve this problem:
  1. Establish a direct connection to the MySQL server and issue the query: SET GLOBAL max_connections = 1024; to change the connection limit at runtime (no downtime).
  2. Make the changes permanent and edit the / etc / my.


The default value for the max_connections system variable is "151". Compare 50K connections. The first step before benchmarking is to increase max_connections to 50,000. We dynamically increased max_connections to 50,000 and what happened after that was not expected, copied the results below:

We have only 697 contacts. Let's interpret the MySQL error log before moving on to the next To the next steps. We copied the same below:


How do I check for too many connections in MySQL?

Correct way to solve this problem:
  1. Establish a direct connection to the MySQL server and issue the query: SET GLOBAL max_connections = 1024; to change the connection limit at runtime (no downtime).
  2. Make the changes permanent and edit the / etc / my.


This is due to the file opening restrictions for MySQL. Now increase the number of open files allowed for MySQL. We have taken the following steps to resolve this resource constraint issue:


1040 error

** MySQL uses some files for extra work and we need to set LimitNOFILE, TasksMax and LimitMPROC above to get 50,000 connections. Set the value to 55000, restart the systemd daemon and restart the MySQL service.

Output

We don't have a recommendation for fixed values ​​for the max_connections system variable. It totally depends on loading your app and managing your app's connection. We advise our clients not to open too many connections at the same time, as each connected thread requires memory and there is also resource intensive context switching that leads to an overall performance degradation. Thanks for reading and comments are welcome!



 

 

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