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(*)
12
select count(*) > 3 from performance_schema.setup_instruments;
count(*) > 3
1
select count(*) from performance_schema.setup_timers;
count(*)
4
select * from performance_schema.accounts;
select * from performance_schema.cond_instances;
select * from performance_schema.events_stages_current;
select * from performance_schema.events_stages_history;
select * from performance_schema.events_stages_history_long;
select * from performance_schema.events_stages_summary_by_account_by_event_name;
select * from performance_schema.events_stages_summary_by_host_by_event_name;
select * from performance_schema.events_stages_summary_by_thread_by_event_name;
select * from performance_schema.events_stages_summary_by_user_by_event_name;
select * from performance_schema.events_stages_summary_global_by_event_name;
select * from performance_schema.events_statements_current;
select * from performance_schema.events_statements_history;
select * from performance_schema.events_statements_history_long;
select * from performance_schema.events_statements_summary_by_account_by_event_name;
select * from performance_schema.events_statements_summary_by_digest;
select * from performance_schema.events_statements_summary_by_host_by_event_name;
select * from performance_schema.events_statements_summary_by_thread_by_event_name;
select * from performance_schema.events_statements_summary_by_user_by_event_name;
select * from performance_schema.events_statements_summary_global_by_event_name;
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_account_by_event_name;
select * from performance_schema.events_waits_summary_by_host_by_event_name;
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_by_user_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.host_cache;
select * from performance_schema.hosts;
select * from performance_schema.mutex_instances;
select * from performance_schema.objects_summary_global_by_type;
select * from performance_schema.performance_timers;
select * from performance_schema.rwlock_instances;
select * from performance_schema.session_account_connect_attrs;
select * from performance_schema.session_connect_attrs;
select * from performance_schema.setup_actors;
select * from performance_schema.setup_consumers;
select * from performance_schema.setup_instruments;
select * from performance_schema.setup_objects;
select * from performance_schema.setup_timers;
select * from performance_schema.socket_instances;
select * from performance_schema.socket_summary_by_instance;
select * from performance_schema.socket_summary_by_event_name;
select * from performance_schema.table_io_waits_summary_by_index_usage;
select * from performance_schema.table_io_waits_summary_by_table;
select * from performance_schema.table_lock_waits_summary_by_table;
select * from performance_schema.threads;
select * from performance_schema.users;
show variables like "performance_schema%";
Variable_name	Value
performance_schema	ON
performance_schema_accounts_size	100
performance_schema_digests_size	200
performance_schema_events_stages_history_long_size	1000
performance_schema_events_stages_history_size	10
performance_schema_events_statements_history_long_size	1000
performance_schema_events_statements_history_size	10
performance_schema_events_waits_history_long_size	10000
performance_schema_events_waits_history_size	10
performance_schema_hosts_size	100
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	5000
performance_schema_max_rwlock_classes	30
performance_schema_max_rwlock_instances	5000
performance_schema_max_socket_classes	10
performance_schema_max_socket_instances	1000
performance_schema_max_stage_classes	150
performance_schema_max_statement_classes	167
performance_schema_max_table_handles	1000
performance_schema_max_table_instances	500
performance_schema_max_thread_classes	50
performance_schema_max_thread_instances	200
performance_schema_session_connect_attrs_size	2048
performance_schema_setup_actors_size	100
performance_schema_setup_objects_size	100
performance_schema_users_size	0
show engine PERFORMANCE_SCHEMA status;
show status like "performance_schema%";
show variables like "performance_schema_users_size";
Variable_name	Value
performance_schema_users_size	0
select count(*) from performance_schema.users;
count(*)
0
select variable_value > 0 from information_schema.global_status
where variable_name like 'PERFORMANCE_SCHEMA_USERS_LOST';
variable_value > 0
1