SET GLOBAL gtid_current_pos= '';
ERROR HY000: Variable 'gtid_current_pos' is a read only variable
SELECT variable_name FROM information_schema.global_variables
WHERE variable_name='gtid_current_pos';
variable_name
GTID_CURRENT_POS
SELECT @@gtid_current_pos;
SELECT @@session.gtid_current_pos;
ERROR HY000: Variable 'gtid_current_pos' is a GLOBAL variable