# bool readonly

#
# show values;
#
select @@global.debug_no_thread_alarm;
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
select @@session.debug_no_thread_alarm;
show global variables like 'debug_no_thread_alarm';
show session variables like 'debug_no_thread_alarm';
select * from information_schema.global_variables where variable_name='debug_no_thread_alarm';
select * from information_schema.session_variables where variable_name='debug_no_thread_alarm';

#
# show that it's read-only
#
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
set global debug_no_thread_alarm=1;
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
set session debug_no_thread_alarm=1;