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