# bool readonly

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

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