install plugin example soname 'ha_example';
create table t1(a int) engine=example;
drop table t1;
alter table mysql.plugin engine=innodb;
  --example[=name]    Enable or disable EXAMPLE plugin. One of: ON, OFF, FORCE
# restart
create table t1(a int) engine=example;
select * from t1;
a
drop table t1;
alter table mysql.plugin engine=aria;
uninstall plugin example;