1select @@global.old;
2@@global.old
30
4select @@session.old;
5@@session.old
60
7show global variables like 'old';
8Variable_name	Value
9old	OFF
10show session variables like 'old';
11Variable_name	Value
12old	OFF
13select * from information_schema.global_variables where variable_name='old';
14VARIABLE_NAME	VARIABLE_VALUE
15OLD	OFF
16select * from information_schema.session_variables where variable_name='old';
17VARIABLE_NAME	VARIABLE_VALUE
18OLD	OFF
19set global old=1;
20set session old=1;
21select @@global.old;
22@@global.old
231
24select @@session.old;
25@@session.old
261
27set @@global.old=DEFAULT;
28