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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 0
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 30
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_file_classes";
Variable_name Value
performance_schema_max_file_classes 0
select count(*) from performance_schema.SETUP_INSTRUMENTS
where name like "wait/io/file/%";
count(*)
0
select variable_value > 0 from information_schema.global_status
where variable_name like 'PERFORMANCE_SCHEMA_FILE_CLASSES_LOST';
variable_value > 0
1
select count(*) from performance_schema.FILE_INSTANCES;
count(*)
0
show status like "performance_schema_file_instances_lost";
Variable_name Value
Performance_schema_file_instances_lost 0
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