select * from performance_schema.performance_timers;
TIMER_NAME	TIMER_FREQUENCY	TIMER_RESOLUTION	TIMER_OVERHEAD
CYCLE	<frequency>	<resolution>	<overhead>
NANOSECOND	<frequency>	<resolution>	<overhead>
MICROSECOND	<frequency>	<resolution>	<overhead>
MILLISECOND	<frequency>	<resolution>	<overhead>
TICK	<frequency>	<resolution>	<overhead>
select * from performance_schema.performance_timers
where timer_name='CYCLE';
TIMER_NAME	TIMER_FREQUENCY	TIMER_RESOLUTION	TIMER_OVERHEAD
CYCLE	<frequency>	<resolution>	<overhead>
insert into performance_schema.performance_timers
set timer_name='FOO', timer_frequency=1,
timer_resolution=2, timer_overhead=3;
ERROR 42000: INSERT command denied to user 'root'@'localhost' for table 'performance_timers'
update performance_schema.performance_timers
set timer_frequency=12 where timer_name='CYCLE';
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'performance_timers'
delete from performance_schema.performance_timers;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'performance_timers'
delete from performance_schema.performance_timers
where timer_name='CYCLE';
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'performance_timers'
LOCK TABLES performance_schema.performance_timers READ;
ERROR 42000: SELECT,LOCK TABL command denied to user 'root'@'localhost' for table 'performance_timers'
UNLOCK TABLES;
LOCK TABLES performance_schema.performance_timers WRITE;
ERROR 42000: SELECT,LOCK TABL command denied to user 'root'@'localhost' for table 'performance_timers'
UNLOCK TABLES;