# bool readonly

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

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