1. Check the error log for the MySQL 1848 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 any processes are running that shouldn't be:
$ mysqladmin -u root -p processlist
4. Check the MySQL user table to see if any users have been added that shouldn't be:
$ mysql -u root -p -e "SELECT * FROM mysql.user;"
5. Check the MySQL privileges table to see if any privileges have been granted that shouldn't be:
$ mysql -u root -p -e "SELECT * FROM mysql.user_privileges;"
6. Check the MySQL database tables to see if any tables have been created that shouldn't be:
$ mysql -u root -p -e "SHOW TABLES;"
7. Check the MySQL database table columns to see if any columns have been added that shouldn't be:
$ mysql -u root -p -e "DESCRIBE table_name;"
8. Check the MySQL database table indexes to see if any indexes have been added that shouldn't be:
$ mysql -u root -p -e "SHOW INDEX FROM table_name;"
9. Once all of the above steps have been completed, restart the MySQL server:
$ service mysql restart
10. Finally, it is recommended to use an automated database observability tool to monitor and fix the MySQL 1848 in question. This tool can provide real-time insights into the performance and health of the database, as well as alerting when any issues arise. This can help to quickly identify and fix any issues that may arise in the future.