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