set @event_scheduler_save= @@global.event_scheduler;
set @slow_query_log_save= @@global.slow_query_log;
set global event_scheduler= on;
set global slow_query_log= on;
set global long_query_time=0.2;
create table t1 (i int);
insert into t1 values (0);
create event ev on schedule at CURRENT_TIMESTAMP + INTERVAL 1 second do update t1 set i=1+sleep(0.5);
FOUND 1 /update t1 set i=1/ in mysqld-slow.log
drop table t1;
set global event_scheduler= @event_scheduler_save;
set global slow_query_log= @slow_query_log_save;
set global long_query_time= @@session.long_query_time;