How to Troubleshoot MySQL Server Timeouts Occurring After 60 Seconds?

MySQL Server Timeouts After 60 Seconds: Troubleshooting

In MySQL, you may encounter the enigmatic error "MySQL server has gone away - in exactly 60 seconds." This issue arises when a query times out while executing, terminating with an unexpected closure. While it's crucial to optimize queries for efficiency, this problem persists even with slower queries designed to run overnight.

Upon investigation, you've observed that the query consistently times out at precisely 60 seconds. This peculiar behavior suggests a configuration issue rather than a resource limitation.

To resolve this issue, let's delve into the potential causes:

1. PHP Configuration:

The PHP configuration setting "mysql.connect_timeout" plays a significant role in this error. It governs not only the connection timeout but also the duration before the first response is received from the server. By default, this timeout is set to 60 seconds.

Solution:

To extend this timeout, implement the following PHP code:

ini_set('mysql.connect_timeout', 300);
ini_set('default_socket_timeout', 300);

With this modification, you're instructing PHP to wait 300 seconds for a response from the server, providing ample time for slow queries to complete.

2. Database Configuration:

Another potential culprit is the MySQL configuration variable "wait_timeout," which determines how long the server waits for a connection before terminating it. Ensure that this value is set appropriately for your workload.

Solution:

If necessary, adjust "wait_timeout" in the MySQL configuration file to a higher value, such as 28800 (8 hours).

3. Other Factors:

Additional factors that might contribute to timeouts include network latency, firewall settings, and server load. Thoroughly review all relevant components to rule out any external influences.

By employing these troubleshooting techniques, you should be able to resolve the issue and prevent the "MySQL server has gone away" error from resurfacing.

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