1. Check the error log for the MySQL 1804 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 version:
$ mysql --version
4. Check the MySQL status:
$ mysqladmin status
5. Check the MySQL process list:
$ mysqladmin processlist
6. Check the MySQL variables:
$ mysqladmin variables
7. Check the MySQL connections:
$ mysqladmin connections
8. Check the MySQL uptime:
$ mysqladmin uptime
9. Check the MySQL threads:
$ mysqladmin threads
10. Check the MySQL flush logs:
$ mysqladmin flush-logs
11. Check the MySQL flush hosts:
$ mysqladmin flush-hosts
12. Check the MySQL flush privileges:
$ mysqladmin flush-privileges
13. Check the MySQL flush status:
$ mysqladmin flush-status
14. Check the MySQL flush tables:
$ mysqladmin flush-tables
15. Check the MySQL flush tables with read lock:
$ mysqladmin flush-tables-with-read-lock
16. Check the MySQL flush user resources:
$ mysqladmin flush-user-resources
17. Check the MySQL ping:
$ mysqladmin ping
18. Check the MySQL shutdown:
$ mysqladmin shutdown
19. Restart the MySQL server:
$ service mysql restart
20. Use an automated database observability tool to monitor and fix the MySQL 1804 in question. Automated database observability tools can provide real-time insights into the performance and health of the database, allowing for quick and easy troubleshooting and resolution of any issues. Additionally, these tools can provide alerts and notifications when any issues arise, allowing for proactive resolution of any potential problems.