update performance_schema.setup_instruments set enabled='YES'
  where name like "wait/synch/mutex/mysys/THR_LOCK_myisam";
drop table if exists test.t1;
drop table if exists test.t2;
drop table if exists test.t3;
truncate table performance_schema.events_waits_history_long;
show variables like "thread_handling";
Variable_name	Value
thread_handling	one-thread-per-connection
"----------------- Connection 1"
create table test.t1(a int) engine=MYISAM;
"----------------- Connection 2"
create table test.t2(a int) engine=MYISAM;
"----------------- Connection 3"
create table test.t3(a int) engine=MYISAM;
"----------------- Connection default"
execute stmt_dump_events using @tid;
event_name	short_source	operation	number_of_bytes
wait/synch/mutex/mysys/THR_LOCK_myisam	mi_create.c:	lock	NULL
execute stmt_dump_thread using @tid;
name
thread/sql/one_connection
execute stmt_dump_events using @tid;
event_name	short_source	operation	number_of_bytes
wait/synch/mutex/mysys/THR_LOCK_myisam	mi_create.c:	lock	NULL
execute stmt_dump_thread using @tid;
name
thread/sql/one_connection
execute stmt_dump_events using @tid;
event_name	short_source	operation	number_of_bytes
wait/synch/mutex/mysys/THR_LOCK_myisam	mi_create.c:	lock	NULL
execute stmt_dump_thread using @tid;
name
thread/sql/one_connection
drop table test.t1;
drop table test.t2;
drop table test.t3;
update performance_schema.setup_instruments set enabled='YES';