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 = $db->query("SET session wait_timeout=28800", FALSE);</code>
By setting wait_timeout to a larger value (in this case, 28800 seconds or 8 hours), MySQL will allow more time for the insertion process to complete before terminating the connection.
Additional Considerations:
<code class="php">$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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