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select @@global.back_log;
@@global.back_log
80
select @@session.back_log;
ERROR HY000: Variable 'back_log' is a GLOBAL variable
show global variables like 'back_log';
Variable_name Value
back_log 80
show session variables like 'back_log';
Variable_name Value
back_log 80
select * from information_schema.global_variables where variable_name='back_log';
VARIABLE_NAME VARIABLE_VALUE
BACK_LOG 80
select * from information_schema.session_variables where variable_name='back_log';
VARIABLE_NAME VARIABLE_VALUE
BACK_LOG 80
set global back_log=1;
ERROR HY000: Variable 'back_log' is a read only variable
set session back_log=1;
ERROR HY000: Variable 'back_log' is a read only variable
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