使用显示警告命令，可以检查发出给代理日志的警告（最多五个）（mcmd.log.）。例如：

mcm> set delayed_insert_timeout：mysqld = 400 mycluster;+ ------------------------------- + |命令结果|+ ------------------------------- + |群集成功重新配置|+ ------------------------------- + MCM>显示警告;+ --------- + ------ + -------------------------------------------------------------------------- + |水平|代码|消息| +---------+------+-----------------------------------------------------------------------+ | Warning | -1 | Config variable delayed_insert_timeout was deprecated in mysqld 5.6.7 | +---------+------+-----------------------------------------------------------------------+