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

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