set @save_expire_logs_days=@@global.expire_logs_days;
flush logs;
set global expire_logs_days = 3;
show variables like 'log_bin%';
Variable_name	Value
log_bin	OFF
log_bin_basename	
log_bin_compress	OFF
log_bin_compress_min_len	256
log_bin_index	
log_bin_trust_function_creators	ON
show variables like 'relay_log%';
Variable_name	Value
relay_log	XXX-relay-bin
relay_log_basename	MYSQLTEST_VARDIR/mysqld.1/data/XXX-relay-bin
relay_log_index	MYSQLTEST_VARDIR/mysqld.1/data/XXX-relay-bin.index
relay_log_info_file	relay-log.info
relay_log_purge	ON
relay_log_recovery	OFF
relay_log_space_limit	0
flush logs;
show variables like 'log_bin%';
Variable_name	Value
log_bin	OFF
log_bin_basename	
log_bin_compress	OFF
log_bin_compress_min_len	256
log_bin_index	
log_bin_trust_function_creators	ON
show variables like 'relay_log%';
Variable_name	Value
relay_log	XXX-relay-bin
relay_log_basename	MYSQLTEST_VARDIR/mysqld.1/data/XXX-relay-bin
relay_log_index	MYSQLTEST_VARDIR/mysqld.1/data/XXX-relay-bin.index
relay_log_info_file	relay-log.info
relay_log_purge	ON
relay_log_recovery	OFF
relay_log_space_limit	0
set global expire_logs_days=@save_expire_logs_days;