SET @start_global_value = @@session.gtid_next;
SELECT @start_global_value;
@start_global_value
AUTOMATIC
select @@global.gtid_next;
ERROR HY000: Variable 'gtid_next' is a SESSION variable
select @@session.gtid_next;
@@session.gtid_next
AUTOMATIC
show global variables like 'gtid_next';
Variable_name	Value
show session variables like 'gtid_next';
Variable_name	Value
gtid_next	AUTOMATIC
select * from information_schema.global_variables where variable_name='gtid_next';
VARIABLE_NAME	VARIABLE_VALUE
select * from information_schema.session_variables where variable_name='gtid_next';
VARIABLE_NAME	VARIABLE_VALUE
GTID_NEXT	AUTOMATIC
set global gtid_next = 1;
ERROR HY000: Variable 'gtid_next' is a SESSION variable and can't be used with SET GLOBAL
set session gtid_next = "ANONYMOUS";
select @@session.gtid_next;
@@session.gtid_next
ANONYMOUS
set session gtid_next = @start_global_value;
select @@session.gtid_next;
@@session.gtid_next
AUTOMATIC