How It Affects Your App
This error indicates that a variable cannot be set when the server is running with GTID enabled. This can have a significant impact on an application as it may prevent certain operations from being performed. For example, if the application requires a certain variable to be set in order to function properly, it will not be able to do so if the server is running with GTID enabled. This can lead to unexpected errors and unexpected behavior in the application. Additionally, it can lead to data integrity issues if the application is not able to properly set the variable.
How To Fix
1. Check the error log for the MySQL 3138 error:
$ tail -f /var/log/mysql/error.log
2. Check the MySQL configuration file for the max_allowed_packet setting:
$ grep max_allowed_packet /etc/mysql/my.cnf
3. Increase the max_allowed_packet setting to a higher value:
max_allowed_packet = 16M
4. Restart the MySQL service:
$ sudo service mysql restart
5. Check the error log again to make sure the MySQL 3138 error is gone:
$ tail -f /var/log/mysql/error.log
6. Use an automated database observability tool to monitor and fix the MySQL 3138 in question. Automated database observability tools can provide real-time insights into the performance and health of your database, allowing you to quickly identify and fix any issues that arise. They can also provide detailed metrics and logs that can help you diagnose and troubleshoot any issues that may arise.
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