MySQL 3147

This error occurs when an invalid cast is attempted from a non-JSON type to a JSON type in MySQL.

How It Affects Your App

MySQL 3147 ER_INVALID_CAST_TO_JSON has a significant impact on an application. It indicates that the application is attempting to cast a value to a JSON type that is not supported. This can lead to unexpected results and data corruption. It can also cause the application to crash or become unresponsive. In addition, it can prevent the application from functioning properly, resulting in a poor user experience.

How To Fix

1. Check the error log for the MySQL 3147 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 3147 error is gone:

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

6. Use an automated database observability tool to monitor and fix the MySQL 3147 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 address any issues that arise. This can help you proactively prevent MySQL 3147 errors from occurring in the future.

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