use information_schema;
select variable_name, s.variable_value, v.global_value
from global_variables s join system_variables v using (variable_name)
where not (s.variable_value <=> v.global_value);
variable_name	variable_value	global_value
select variable_name, s.variable_value, v.session_value
from session_variables s join system_variables v using (variable_name)
where v.variable_scope != 'GLOBAL' and
not (s.variable_value <=> v.session_value);
variable_name	variable_value	session_value