Why Is My PDO Loop Throwing 'MySQL Server Has Gone Away' Error?

How to Resolve "MySQL Server Has Gone Away" Error in PDO Loop

In a scenario involving a PDO-based script executing a loop of prepared statements, it has been encountered that execution fails with the "MySQL server has gone away" error. Understanding the underlying cause and implementing a solution are crucial for maintaining the integrity of the script.

The error typically arises when a packet sent to the server exceeds its maximum allowed packet size. This can occur when large BLOB (Binary Large OBject) data is attempted for insertion.

To determine the source of the problem, examining both the client-side and server-side error messages is recommended. On the client side, the aforementioned error message is displayed, while the server log may indicate "Error 1153 Got a packet bigger than 'max_allowed_packet' bytes."

The resolution involves adjusting the max_allowed_packet value in the my.ini file to accommodate the size of the largest BLOB. This value should be set accordingly, ensuring that it is larger than any anticipated BLOB insertion.

For instance, the following entry in my.ini sets the maximum packet size to 200 megabytes:

[mysqld]
...
max_allowed_packet = 200M
...

By implementing this change, the script should be able to successfully execute the loop of prepared statements without encountering the "MySQL server has gone away" error.

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