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show databases;
Database
information_schema
mtr
mysql
performance_schema
test
select count(*) from performance_schema.performance_timers;
count(*)
5
select count(*) from performance_schema.setup_consumers;
count(*)
8
select count(*) > 0 from performance_schema.setup_instruments;
count(*) > 0
1
select count(*) from performance_schema.setup_timers;
count(*)
1
select * from performance_schema.cond_instances;
select * from performance_schema.events_waits_current;
select * from performance_schema.events_waits_history;
select * from performance_schema.events_waits_history_long;
select * from performance_schema.events_waits_summary_by_instance;
select * from performance_schema.events_waits_summary_by_thread_by_event_name;
select * from performance_schema.events_waits_summary_global_by_event_name;
select * from performance_schema.file_instances;
select * from performance_schema.file_summary_by_event_name;
select * from performance_schema.file_summary_by_instance;
select * from performance_schema.mutex_instances;
select * from performance_schema.performance_timers;
select * from performance_schema.rwlock_instances;
select * from performance_schema.setup_consumers;
select * from performance_schema.setup_instruments;
select * from performance_schema.setup_timers;
select * from performance_schema.threads;
show variables like "performance_schema%";
Variable_name Value
performance_schema ON
performance_schema_events_waits_history_long_size 10000
performance_schema_events_waits_history_size 10
performance_schema_max_cond_classes 80
performance_schema_max_cond_instances 1000
performance_schema_max_file_classes 50
performance_schema_max_file_handles 32768
performance_schema_max_file_instances 10000
performance_schema_max_mutex_classes 200
performance_schema_max_mutex_instances 10000
performance_schema_max_rwlock_classes 0
performance_schema_max_rwlock_instances 10000
performance_schema_max_table_handles 1000
performance_schema_max_table_instances 500
performance_schema_max_thread_classes 50
performance_schema_max_thread_instances 1000
show engine PERFORMANCE_SCHEMA status;
show status like "performance_schema%";
show variables like "performance_schema_max_rwlock_classes";
Variable_name Value
performance_schema_max_rwlock_classes 0
select count(*) from performance_schema.setup_instruments
where name like "wait/synch/rwlock/%";
count(*)
0
select variable_value > 0 from information_schema.global_status
where variable_name like 'PERFORMANCE_SCHEMA_RWLOCK_CLASSES_LOST';
variable_value > 0
1
select count(*) from performance_schema.rwlock_instances;
count(*)
0
show status like "performance_schema_rwlock_instances_lost";
Variable_name Value
Performance_schema_rwlock_instances_lost 0
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