How to Fix 'MySQL Server Has Gone Away' Errors During PDO Loop Execution?

Troubleshooting MySQL "Server Has Gone Away" Issue During PDO Loop Execution

An issue frequently encountered during PHP script execution is encountering the "MySQL server has gone away" error when executing a loop using PDO prepared statements. This error arises when a large amount of data is being processed, exceeding the server's maximum allowable packet size.

Root Cause:

The primary culprit of this error is sending a packet to the MySQL server that surpasses the predefined limit set by the 'max_allowed_packet' configuration. This typically occurs when large BLOB (Binary Large Object) insertions attempt to exceed the server's capacity.

Error Messages:

• Client-side: "MySQL server has gone away"
• Server-side (if error logging is enabled): "Error 1153 Got a packet bigger than 'max_allowed_packet' bytes"

Solution:

To resolve this issue, the 'max_allowed_packet' setting in the 'my.ini' configuration file must be increased to accommodate the size of the largest BLOB insertion anticipated. For instance:

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

This adjustment permits the MySQL server to handle packets of up to 200 megabytes, ensuring successful execution of BLOB insertions within the defined limit.

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