How to Fix the \'MySQL server has gone away\' Error: A Guide to Understanding and Resolving Database Disconnections?

How to Resolve MySQL Server Disconnection Error: "MySQL server has gone away"

When performing database insertions, the error "General error: 2006 MySQL server has gone away" can occur, particularly after processing a specific number of records.

Cause:

The root cause of this issue is typically related to MySQL's wait_timeout variable. When MySQL waits longer than the specified timeout period for a response from the client, it terminates the connection.

Solution:

To address this problem, you can modify the wait_timeout session variable before executing the insertion query:

<code class="php">$results = $db->query("SET session wait_timeout=28800", FALSE);</code>

By setting wait_timeout to a larger value (in this case, 28800 seconds or 8 hours), MySQL will allow more time for the insertion process to complete before terminating the connection.

Additional Considerations:

• It's important to note that increasing the wait_timeout may not always be the best solution. Setting it too high can result in excessive server resource consumption.
• Consult best practices for setting wait_timeout appropriately based on the specific requirements of your application.
• If the issue persists, consider adjusting the interactive_timeout variable as well:

<code class="php">$results = $db->query("SET session interactive_timeout=28800", FALSE);</code>

This modification can prevent MySQL from terminating the connection due to inactivity during the insertion process.

Verification:

<code class="php">$results = $db->query("SHOW VARIABLES LIKE '%timeout%'", TRUE);
echo "<pre class="brush:php;toolbar:false">";
var_dump($results);
echo "

";

This code will display the current settings of the wait_timeout and interactive_timeout variables to confirm that they have been modified.

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