How to Fix the 'MySQL Server has Gone Away' Error During Large SQL File Imports?

Troubleshooting "MySQL Server has Gone Away" Error When Importing Large SQL Files

Problem:

Users attempting to import large SQL files through phpMyAdmin encounter the error message "MySQL server has gone away."

Solution:

This error can typically be attributed to two primary causes, as per the provided reference:

1. Server Timeout: The server's wait_timeout configuration value in its my.cnf file may be too low. To fix this, increase the wait_timeout to a larger value (e.g., 600 seconds).
2. Incorrect or Oversized Packet: The server may have received an incorrect or excessively large packet, causing it to terminate the connection. To address this, increase the max_allowed_packet value in the my.cnf file (e.g., 64M).

Additional Notes:

• Ensure that these adjustments are made in the correct configuration file, typically located in the mysql/data directory.
• Specify the options under the appropriate section headers, such as [client] or [myslqd].
• For example:

[mysqld]
wait_timeout = 600
max_allowed_packet = 64M

• After making these changes, restart the MySQL server.
• To verify the updated values, execute the following commands in the mysql client:

> select @@wait_timeout;
> select @@max_allowed_packet;

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