flush logs;
set global expire_logs_days = 3;
show variables like 'log_bin%';
Variable_name	Value
log_bin	OFF
log_bin_trust_function_creators	ON
flush logs;
show variables like 'log_bin%';
Variable_name	Value
log_bin	OFF
log_bin_trust_function_creators	ON
set global expire_logs_days = 0;