show databases;
Database
__recycle_bin__
information_schema
mtr
mysql
performance_schema
sys
test
select count(*) from performance_schema.performance_timers;
count(*)
4
select count(*) from performance_schema.setup_consumers;
count(*)
15
select count(*) > 4 from performance_schema.setup_instruments;
count(*) > 4
1
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_histogram_by_digest;
select * from performance_schema.events_statements_histogram_global;
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_transactions_current;
select * from performance_schema.events_transactions_history;
select * from performance_schema.events_transactions_history_long;
select * from performance_schema.events_transactions_summary_by_account_by_event_name;
select * from performance_schema.events_transactions_summary_by_host_by_event_name;
select * from performance_schema.events_transactions_summary_by_thread_by_event_name;
select * from performance_schema.events_transactions_summary_by_user_by_event_name;
select * from performance_schema.events_transactions_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.memory_summary_by_account_by_event_name;
select * from performance_schema.memory_summary_by_host_by_event_name;
select * from performance_schema.memory_summary_by_thread_by_event_name;
select * from performance_schema.memory_summary_by_user_by_event_name;
select * from performance_schema.memory_summary_global_by_event_name;
select * from performance_schema.events_errors_summary_by_account_by_error;
select * from performance_schema.events_errors_summary_by_host_by_error;
select * from performance_schema.events_errors_summary_by_thread_by_error;
select * from performance_schema.events_errors_summary_by_user_by_error;
select * from performance_schema.events_errors_summary_global_by_error;
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.memory_summary_by_account_by_event_name;
select * from performance_schema.memory_summary_by_host_by_event_name;
select * from performance_schema.memory_summary_by_thread_by_event_name;
select * from performance_schema.memory_summary_by_user_by_event_name;
select * from performance_schema.memory_summary_global_by_event_name;
select * from performance_schema.metadata_locks;
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.data_locks;
select * from performance_schema.data_lock_waits;
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_threads;
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_handles;
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;
select * from performance_schema.replication_connection_configuration;
select * from performance_schema.replication_connection_status;
select * from performance_schema.replication_applier_configuration;
select * from performance_schema.replication_applier_status;
select * from performance_schema.replication_applier_status_by_coordinator;
select * from performance_schema.replication_applier_status_by_worker;
select * from performance_schema.global_status;
select * from performance_schema.status_by_thread;
select * from performance_schema.status_by_user;
select * from performance_schema.status_by_host;
select * from performance_schema.status_by_account;
select * from performance_schema.session_status;
select * from performance_schema.global_variables;
select * from performance_schema.variables_by_thread;
select * from performance_schema.session_variables;
show engine PERFORMANCE_SCHEMA status;
show global status like "performance_schema%";
drop table if exists db1.t1;
drop database if exists db1;
create database db1;
create table db1.t1 (a int, b char(10) default 'default',
unique key uidx(a));
insert into db1.t1 values('1', 'abc');
insert into db1.t1 values('2', 'abc');
select * from db1.t1 where a='1';
a	b
1	abc
select COUNT_STAR, OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME
from performance_schema.table_io_waits_summary_by_table
where OBJECT_SCHEMA='db1'
  order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME;
COUNT_STAR	OBJECT_TYPE	OBJECT_SCHEMA	OBJECT_NAME
3	TABLE	db1	t1
select COUNT_STAR, OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME
from performance_schema.table_io_waits_summary_by_index_usage
where OBJECT_SCHEMA='db1'
  order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME;
COUNT_STAR	OBJECT_TYPE	OBJECT_SCHEMA	OBJECT_NAME	INDEX_NAME
2	TABLE	db1	t1	NULL
1	TABLE	db1	t1	(index 0)
flush tables;
select COUNT_STAR, OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME
from performance_schema.table_io_waits_summary_by_table
where OBJECT_SCHEMA='db1'
  order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME;
COUNT_STAR	OBJECT_TYPE	OBJECT_SCHEMA	OBJECT_NAME
0	TABLE	db1	t1
select COUNT_STAR, OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME
from performance_schema.table_io_waits_summary_by_index_usage
where OBJECT_SCHEMA='db1'
  order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME;
COUNT_STAR	OBJECT_TYPE	OBJECT_SCHEMA	OBJECT_NAME	INDEX_NAME
select variable_value > 0 from performance_schema.global_status
where variable_name like 'PERFORMANCE_SCHEMA_INDEX_STAT_LOST';
variable_value > 0
1
FLUSH STATUS;
select variable_value from performance_schema.global_status
where variable_name like 'PERFORMANCE_SCHEMA_INDEX_STAT_LOST';
variable_value
0
create table db1.t2 (a int, b char(10) default 'default',
unique key uidx(a));
insert into db1.t1 values('3', 'abc');
insert into db1.t1 values('4', 'abc');
select * from db1.t1 where a='1';
a	b
1	abc
insert into db1.t2 values('1', 'abc');
insert into db1.t2 values('2', 'abc');
select * from db1.t2 where a='1';
a	b
1	abc
select COUNT_STAR, OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME
from performance_schema.table_io_waits_summary_by_table
where OBJECT_SCHEMA='db1'
  order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME;
COUNT_STAR	OBJECT_TYPE	OBJECT_SCHEMA	OBJECT_NAME
3	TABLE	db1	t1
3	TABLE	db1	t2
select COUNT_STAR, OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME
from performance_schema.table_io_waits_summary_by_index_usage
where OBJECT_SCHEMA='db1'
  order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME;
COUNT_STAR	OBJECT_TYPE	OBJECT_SCHEMA	OBJECT_NAME	INDEX_NAME
2	TABLE	db1	t1	NULL
1	TABLE	db1	t1	(index 0)
2	TABLE	db1	t2	NULL
1	TABLE	db1	t2	(index 0)
flush tables;
select COUNT_STAR, OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME
from performance_schema.table_io_waits_summary_by_table
where OBJECT_SCHEMA='db1'
  order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME;
COUNT_STAR	OBJECT_TYPE	OBJECT_SCHEMA	OBJECT_NAME
0	TABLE	db1	t1
0	TABLE	db1	t2
select COUNT_STAR, OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME
from performance_schema.table_io_waits_summary_by_index_usage
where OBJECT_SCHEMA='db1'
  order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME;
COUNT_STAR	OBJECT_TYPE	OBJECT_SCHEMA	OBJECT_NAME	INDEX_NAME
select variable_value > 0 from performance_schema.global_status
where variable_name like 'PERFORMANCE_SCHEMA_INDEX_STAT_LOST';
variable_value > 0
1
FLUSH STATUS;
update performance_schema.setup_objects set ENABLED='NO' where OBJECT_TYPE='TABLE';
insert into db1.t1 values('5', 'abc');
insert into db1.t1 values('6', 'abc');
select * from db1.t1 where a='1';
a	b
1	abc
insert into db1.t2 values('3', 'abc');
insert into db1.t2 values('4', 'abc');
select * from db1.t2 where a='1';
a	b
1	abc
select COUNT_STAR, OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME
from performance_schema.table_io_waits_summary_by_table
where OBJECT_SCHEMA='db1'
  order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME;
COUNT_STAR	OBJECT_TYPE	OBJECT_SCHEMA	OBJECT_NAME
0	TABLE	db1	t1
0	TABLE	db1	t2
select COUNT_STAR, OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME
from performance_schema.table_io_waits_summary_by_index_usage
where OBJECT_SCHEMA='db1'
  order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME;
COUNT_STAR	OBJECT_TYPE	OBJECT_SCHEMA	OBJECT_NAME	INDEX_NAME
flush tables;
select COUNT_STAR, OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME
from performance_schema.table_io_waits_summary_by_table
where OBJECT_SCHEMA='db1'
  order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME;
COUNT_STAR	OBJECT_TYPE	OBJECT_SCHEMA	OBJECT_NAME
0	TABLE	db1	t1
0	TABLE	db1	t2
select COUNT_STAR, OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME
from performance_schema.table_io_waits_summary_by_index_usage
where OBJECT_SCHEMA='db1'
  order by OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME;
COUNT_STAR	OBJECT_TYPE	OBJECT_SCHEMA	OBJECT_NAME	INDEX_NAME
select variable_value from performance_schema.global_status
where variable_name like 'PERFORMANCE_SCHEMA_INDEX_STAT_LOST';
variable_value
0
drop database db1;
update performance_schema.setup_objects set ENABLED='YES'
  where OBJECT_TYPE='TABLE' and OBJECT_SCHEMA="%";