How It Affects Your App
MySQL 1199 ER_SLAVE_NOT_RUNNING can have a significant impact on an application. If the slave is not running, the application may not be able to access the data it needs, leading to errors or unexpected behavior. Additionally, the application may not be able to replicate data from the master, leading to data loss or inconsistency. This can cause serious issues for applications that rely on data replication for their operations. Finally, the application may not be able to perform certain operations, such as backups, due to the slave not running.
How To Fix
1. Check the error log for the MySQL 1199 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 server:
$ sudo service mysql restart
5. Check the error log again to make sure the MySQL 1199 error is gone:
$ tail -f /var/log/mysql/error.log
6. Use an automated database observability tool to monitor and fix the MySQL 1199 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 MySQL 1199 errors that may occur.
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