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

Addressing the "MySQL Server has Gone Away" Error During SQL Import

When encountering the "MySQL Server has gone away" error while importing a sizeable SQL file via phpMyAdmin, two primary factors can be responsible for this issue:

• Server Timeout: The server may have terminated the connection due to inactivity. To resolve this, ensure that the wait_timeout variable in the my.cnf configuration file is sufficiently long. For instance, on Debian-based systems, you can set wait_timeout = 600 seconds to prolong the server's patience.
• Large or Malformed Packet: The server might have severed the transmission after receiving an excessively voluminous or malformed packet. To address this, you can increase the maximum packet size limit by adjusting the max_allowed_packet value within the same my.cnf file. On Debian, set max_allowed_packet = 64M to permit the server to handle hefty packets without terminating the connection.

Note: MySQL configuration files do not provide default commentary like other settings files. Consequently, you must manually insert any modifications into relevant option groups, such as [mysqld], within the my.cnf or my.ini files. For clarity, the following snippet represents appropriate settings:

[mysqld]
wait_timeout = 600
max_allowed_packet = 64M

Once you have made the necessary adjustments, be sure to restart the MySQL server. To verify these settings, you can execute the following commands in the MySQL client:

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

By implementing these measures, you can prevent the "MySQL Server has gone away" error from disrupting your SQL imports, enabling you to successfully load large data files into your database.

The above is the detailed content of How to Fix the 'MySQL Server has Gone Away' Error During Large SQL Imports?. For more information, please follow other related articles on the PHP Chinese website!