Why Does My MySQL Server Report 'Has Gone Away' During Large SQL File Imports, and How Can I Fix It?

How to Resolve "MySQL Server has Gone Away" Error During SQL File Import

When attempting to import a large SQL file via phpMyAdmin, the dreaded "MySQL server has gone away" error can surface. To rectify this issue, consider the following causes and solutions:

Server Connection Timeout

The MySQL server has a default timeout period for inactive connections. If the import process exceeds this timeout, the server terminates the connection, causing the error. To resolve this:

1. Edit the my.cnf Configuration File:

   • On Debian: sudo nano /etc/mysql/my.cnf

2. Increase the wait_timeout Variable:

   • Set wait_timeout = 600 seconds (adjust according to your needs).

3. Restart the MySQL Server:

   • sudo /etc/init.d/mysql restart

Large or Incorrect Packet Size

In some cases, the server may disconnect if it receives an excessively large or malformed packet. To address this:

1. Edit the my.cnf Configuration File:

   • On Debian: sudo nano /etc/mysql/my.cnf

2. Increase the max_allowed_packet Variable:

   • Set max_allowed_packet = 64M (adjust according to your requirements).

3. Restart the MySQL Server:

   • sudo /etc/init.d/mysql restart

Additional Tips

• Ensure the SQL file is not truncated or corrupted.
• If using a command-line tool, try using the --max_allowed_packet option.
• Check the MySQL server logs for additional error messages.

By implementing these measures, you can successfully resolve the "MySQL server has gone away" error and complete the SQL file import process.

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