zen cart后台出现这个警告，是因为管理员数据库缓存超过两个月没有清空，请进入后台清空管理员数据库缓存即可，方法为：
zen-cart后台->
tools->
Store Manager->
点击Empty Admin Activity Log table from the database一项后面的reset按钮。
附：（该选项的详细说明）
Empty Admin Activity Log table from the database
WARNING: Be sure to backup your database before running this update!
The Admin Activity Log is a tracking method that records activity in the Admin. Due to its nature it can become very large, very fast and does need to be cleaned out from time to time.
Warnings are given at 50,000 records or 60 days, which ever happens first.