使用该show warnings命令，您可以检查向代理日志 ( ) 发出的警告（最多最后五个mcmd.log）。例如：

mcm> set delayed_insert_timeout:mysqld=400 mycluster;
+-----------------------------------+
| Command result                    |
+-----------------------------------+
| Cluster reconfigured successfully |
+-----------------------------------+

mcm> show warnings;
+---------+------+-----------------------------------------------------------------------+
| Level   | Code | Message                                                               |
+---------+------+-----------------------------------------------------------------------+
| Warning | -1   | Config variable delayed_insert_timeout was deprecated in mysqld 5.6.7 |
+---------+------+-----------------------------------------------------------------------+