How to Fix MySQL Error 2006: 'MySQL Server Has Gone Away'?

Troubleshooting 'MySQL Error 2006: MySQL Server Has Gone Away'

When executing operations against a remote MySQL server, users may encounter the 'MySQL server has gone away' error (code 2006). This error indicates an unexpected server termination during the operation. To resolve this issue, it is crucial to understand the underlying cause and implement appropriate measures.

Determining the Impact of WAIT_TIMEOUT

WAIT_TIMEOUT is a MySQL parameter that controls the maximum time the server waits for a response from the client before closing the connection. By default, this setting is different on the office server and remote MySQL server. Therefore, it is important to check both server configurations to determine if an adjustment is required.

Addressing the Root Cause: Max Allowed Packet Size

In this case, the root cause of the error is often a low default setting for the max_allowed_packet parameter. This parameter defines the maximum size of packets that can be sent and received by the server. Increasing its value allows the server to handle larger data transfers without encountering 'connection gone away' errors.

Modifying the max_allowed_packet Setting

To modify the max_allowed_packet setting:

1. Open the my.cnf configuration file located under /etc/ or in the data directory (for Windows users).

2. Locate the [mysqld] section and add the following line:

   max_allowed_packet=16M

3. Restart the MySQL service.

Alternative Solution

For situations where modifying the my.cnf file is not possible, you can use the following commands to set the parameter temporarily:

• On Linux:

  SET GLOBAL max_allowed_packet=104857600

• On Windows:

  SET GLOBAL max_allowed_packet=104857600

Finally, it is essential to ensure that encoding is set to ANSI for proper execution of the configuration changes.

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