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

MySQL Error 2006: Resolving "Mysql Server Has Gone Away"

When encountering the error "2006, MySQL server has gone away" during data processing to a remote MySQL server, it's essential to understand the root cause. While the "wait_timeout" setting is commonly known, it's important to note that the solution may lie elsewhere.

Understanding the Issue

The error "MySQL server has gone away" can occur when data processing exceeds the default limitation set by the MySQL configuration parameter "max_allowed_packet." This parameter controls the maximum size of data that can be transmitted between the client and the server in a single packet.

Solution: Adjusting max_allowed_packet

To resolve the issue, it's recommended to increase the value of "max_allowed_packet." This can be done by modifying the MySQL configuration file (/etc/my.cnf for Linux systems).

Configuration Steps:

1. Open the MySQL configuration file (/etc/my.cnf).
2. Navigate to the [mysqld] section.
3. Add or modify the following line:

max_allowed_packet=16M

4. Save the configuration file.
5. Restart the MySQL daemon to apply the changes.

Additional Notes:

• On Windows systems, save the configuration file (my.ini or my.cnf) with ANSI encoding, not UTF-8.

• The change to max_allowed_packet can be made while the server is running using the command:

  SET GLOBAL max_allowed_packet=104857600;

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• The default value for max_allowed_packet in MySQL 5.7 is 4MB. By increasing it to 8MB or 16MB, the issue can typically be resolved.
• For permanent changes, save the modified configuration file and restart the MySQL daemon.

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