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