CREATE
    /*[DEFINER = { user | CURRENT_USER }]*/
    TRIGGER `mysql`.`test` BEFORE DELETE
    ON `mysql`.`db`
    FOR EACH ROW BEGIN
    INSERT INTO cescnet.db_monitor (DB_name,user_name,dateandtime,operation_type) VALUES (mysql.db.Db,CURRENT_USER(),NOW(),'Delete');
    END;|

Triggers can not be created on system tables

grant super on *.* to root@localhost
grant all on *.* to root@localhost

Triggers can not be created on system tables