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