1select * from performance_schema.mutex_instances limit 1; 2select * from performance_schema.mutex_instances 3where name='FOO'; 4insert into performance_schema.mutex_instances 5set name='FOO', object_instance_begin=12; 6ERROR 42000: INSERT command denied to user 'root'@'localhost' for table 'mutex_instances' 7update performance_schema.mutex_instances 8set name='FOO'; 9ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'mutex_instances' 10delete from performance_schema.mutex_instances 11where name like "wait/%"; 12ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'mutex_instances' 13delete from performance_schema.mutex_instances; 14ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'mutex_instances' 15LOCK TABLES performance_schema.mutex_instances READ; 16ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'mutex_instances' 17UNLOCK TABLES; 18LOCK TABLES performance_schema.mutex_instances WRITE; 19ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'mutex_instances' 20UNLOCK TABLES; 21