MySQL 121

This error occurs when a user attempts to write or update a record in a database table that has a unique index or primary key, and the new record contains a value that already exists in the table.

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How It Affects Your App

MySQL 121 Duplicate key on write or update can cause an application to fail to write or update data in the database. This can lead to data inconsistency and data loss, as well as a decrease in application performance. It can also lead to unexpected errors and unexpected behavior in the application. In some cases, it can even cause the application to crash.

How To Fix

1. Check the error log for the MySQL 121 instance to identify the root cause of the issue.

$ sudo tail -f /var/log/mysql/error.log

2. Check the configuration of the MySQL 121 instance to identify any misconfigurations.

$ sudo cat /etc/mysql/my.cnf

3. Check the status of the MySQL 121 instance to identify any issues with the running processes.

$ sudo systemctl status mysql

4. Restart the MySQL 121 instance to reset any misconfigurations or issues with the running processes.

$ sudo systemctl restart mysql

5. Use an automated database observability tool to monitor and fix the MySQL 121 instance. Automated database observability tools can provide real-time insights into the performance and health of the MySQL 121 instance, allowing for quick and easy identification and resolution of any issues. Additionally, these tools can provide automated alerts when any issues arise, allowing for quick resolution of any issues.

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