How to View and Modify MySQL Connection Timeout Settings?

How can I see or change MySQL connection timeout settings?

Managing MySQL connection timeout settings is crucial for optimizing database performance and preventing unexpected disconnects. This guide will help you understand how to view and modify these settings effectively.

SELECT variable_name, value FROM performance_schema.global_variables WHERE variable_name IN ('wait_timeout', 'interactive_timeout');

SET GLOBAL wait_timeout = 3600; -- Change global wait timeout to 1 hour
SET GLOBAL interactive_timeout = 3600; -- Change global interactive timeout to 1 hour
FLUSH HOSTS; -- Optionally flush hosts to apply

Causes

• Long-running queries
• Inactive connections
• Network issues or high latency

Solutions

• To view the current MySQL timeout settings, use the following query in MySQL client:
• SET @@global.wait_timeout = 28800; -- Sets the global wait timeout to 28800 seconds (8 hours)
• SET @@global.interactive_timeout = 28800; -- Sets the interactive timeout for connections to 8 hours

Mistake: Not adjusting timeouts based on application needs.

Solution: Evaluate your application to determine suitable timeout values based on expected activity.

Mistake: Failure to check current timeout settings before changes.

Solution: Always query the current settings before making modifications.