select * from performance_schema.MUTEX_INSTANCES limit 1;
NAME	OBJECT_INSTANCE_BEGIN	LOCKED_BY_THREAD_ID
#	#	#
select * from performance_schema.MUTEX_INSTANCES
where name='FOO';
NAME	OBJECT_INSTANCE_BEGIN	LOCKED_BY_THREAD_ID
insert into performance_schema.MUTEX_INSTANCES
set name='FOO', object_instance_begin=12;
ERROR 42000: INSERT command denied to user 'root'@'localhost' for table 'MUTEX_INSTANCES'
update performance_schema.MUTEX_INSTANCES
set name='FOO';
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'MUTEX_INSTANCES'
delete from performance_schema.MUTEX_INSTANCES
where name like "wait/%";
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'MUTEX_INSTANCES'
delete from performance_schema.MUTEX_INSTANCES;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'MUTEX_INSTANCES'
LOCK TABLES performance_schema.MUTEX_INSTANCES READ;
ERROR 42000: SELECT,LOCK TABL command denied to user 'root'@'localhost' for table 'MUTEX_INSTANCES'
UNLOCK TABLES;
LOCK TABLES performance_schema.MUTEX_INSTANCES WRITE;
ERROR 42000: SELECT,LOCK TABL command denied to user 'root'@'localhost' for table 'MUTEX_INSTANCES'
UNLOCK TABLES;