1. Check the error log for the MySQL 1826 error:
$ tail -f /var/log/mysql/error.log
2. Check the MySQL configuration file for any misconfigurations:
$ cat /etc/mysql/my.cnf
3. Check the MySQL process list to see if there are any processes that are running that shouldn't be:
$ mysqladmin -u root -p processlist
4. Check the MySQL user table to see if there are any users that shouldn't have access:
$ mysql -u root -p -e "SELECT * FROM mysql.user;"
5. Check the MySQL grant tables to see if there are any grants that shouldn't be in place:
$ mysql -u root -p -e "SELECT * FROM mysql.db;"
6. Check the MySQL system variables to see if there are any variables that are set incorrectly:
$ mysql -u root -p -e "SHOW VARIABLES;"
7. Check the MySQL system status to see if there are any issues with the system:
$ mysql -u root -p -e "SHOW STATUS;"
8. Use an automated database observability tool to monitor and fix the MySQL 1826 in question. Automated database observability tools can provide real-time visibility into the performance and health of your database, allowing you to quickly identify and fix any issues that arise. They can also provide detailed insights into the root cause of any issues, allowing you to take proactive steps to prevent them from occurring in the future.