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select @@global.old;
@@global.old
0
select @@session.old;
ERROR HY000: Variable 'old' is a GLOBAL variable
show global variables like 'old';
Variable_name Value
old OFF
show session variables like 'old';
Variable_name Value
old OFF
select * from information_schema.global_variables where variable_name='old';
VARIABLE_NAME VARIABLE_VALUE
OLD OFF
select * from information_schema.session_variables where variable_name='old';
VARIABLE_NAME VARIABLE_VALUE
OLD OFF
set global old=1;
ERROR HY000: Variable 'old' is a read only variable
set session old=1;
ERROR HY000: Variable 'old' is a read only variable
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