MySQL · December 20, 2023

How to Fix MySQL Error 2013 - (CR_SERVER_LOST) Lost connection to MySQL server during query

How to Fix MySQL Error 2013 - (CR_SERVER_LOST) Lost connection to MySQL server during query

MySQL is a popular open-source relational database management system used by many websites and applications. However, like any software, it can encounter errors that can disrupt its normal operation. One such error is the MySQL Error 2013, also known as CR_SERVER_LOST, which occurs when the connection to the MySQL server is lost during a query.

Causes of MySQL Error 2013

There can be several reasons why you might encounter the MySQL Error 2013:

  • Network Issues: The most common cause of this error is network connectivity problems. If there is a sudden interruption in the network connection between the client and the MySQL server, the connection can be lost, resulting in the error.
  • Server Overload: If the MySQL server is under heavy load or experiencing high traffic, it may not be able to handle all the incoming requests, leading to connection timeouts and the error.
  • Firewall or Proxy Settings: Sometimes, firewall or proxy settings can interfere with the MySQL connection, causing it to be lost during a query.
  • Server Configuration: Incorrect server configuration settings, such as low values for the wait_timeout or interactive_timeout variables, can also trigger the error.

Fixing MySQL Error 2013

Here are some steps you can take to fix the MySQL Error 2013:

1. Check Network Connectivity

Ensure that there are no network connectivity issues between the client and the MySQL server. Check if there are any network interruptions, firewall restrictions, or proxy settings that might be causing the problem. You can try pinging the server or using other network diagnostic tools to identify any network-related issues.

2. Optimize Server Performance

If the MySQL server is under heavy load or experiencing high traffic, consider optimizing its performance. You can try increasing the server's resources, such as CPU, memory, or disk space, to handle the incoming requests more efficiently. Additionally, you can optimize your database queries and indexes to improve query execution time and reduce the chances of encountering the error.

3. Adjust Server Configuration

Review the server configuration settings and make any necessary adjustments. Specifically, check the values of the wait_timeout and interactive_timeout variables. These variables determine the amount of time a connection can remain idle before it is closed. If the values are too low, increase them to allow for longer idle periods.

4. Enable Persistent Connections

Consider enabling persistent connections in your application. Persistent connections allow the client to reuse the same connection for multiple queries, reducing the overhead of establishing a new connection for each query. This can help mitigate the chances of encountering the error.

5. Update MySQL Version

If you are using an older version of MySQL, consider updating to the latest stable release. Newer versions often include bug fixes and performance improvements that can help resolve known issues, including the MySQL Error 2013.

Summary

MySQL Error 2013, or CR_SERVER_LOST, can occur when the connection to the MySQL server is lost during a query. It can be caused by network issues, server overload, firewall or proxy settings, or incorrect server configuration. To fix the error, check network connectivity, optimize server performance, adjust server configuration, enable persistent connections, and consider updating MySQL to the latest version.

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