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.

Never worry about your database again!

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.

Never worry about your database again!

Let us show you how you can free your engineering team from database worries with 75% MTTR reduction

CTA Image

Featured Articles

Why Doesn't Postgres Use My Index

All Your Monitoring Solutions Are Just Wrong

8 Proven Strategies to Improve Database Performance

The only way to

optimize

monitor

protect

troubleshoot

optimize

your database

Prevent slow queries from reaching production

Gain a clear understanding of all your queries pre production. With metis analysis and enrichment engine, you can detect slow queries, get insights into their potential impact on your production environment, and receive immediate remediation and optimization plans.

Schema migration analysis

Elevate your confidence in schema migrations. Regardless of how you handle them, whether it's through ORM, Flyway, or other methods, gain the ability to identify potential data loss, receive estimates of migration duration, and optimize the process. Migrate with precision, just as you intended.

Procative Monitoring Badge

Proactive monitoring. It's not only about slow queries

Use monitoring that actually helps you get ahead of your database problems. Detect schema drifts, configurations and access patterns. Dont just wait until your database performance affects your customers, Take a proactive stance by receiving alerts at the first signs of deviations, enhancing database resilience, and instilling customer assurance through optimized speed and reliability.

Troubleshoot Icon

The database troubleshooting platform you deserve

Say goodbye to uninformative dashboards that provide no valuable insights. Proactively identify and fix drifts in your database from the moment they arise. Continuously analyze, fix and optimize your queries, configurations and much more!

Related Content

MySQL 3229

This error occurs when attempting to group by a timestamp column in a Daylight Savings Time zone.

MySQL 3230

This error indicates that MySQL cannot start a server using a named pipe. It is a MySQL 3230 error code.

MySQL 3228

This error indicates that MySQL cannot open the error log file. It is usually caused by incorrect permissions or a missing file.

MySQL 3227

This error occurs when attempting to use replication filters with XA transactions. It indicates that replication filters are not supported for XA transactions.

Never worry about your
database again!

Start using Metis and get your database guardrails set up in minutes