更改zabbix数据库mandatory

问题描述：

zabbix web GUI从2.4.5升级到3.2.6，web界面报如下错误：

The frontend does not match Zabbix database. Current database version (mandatory/optional): 2040000/2040000. Required mandatory version: 3020000. Contact your system administrator.

处理方法：

mysql> use zabbix;

mysql> update dbversion set mandatory=3020000;

mysql> flush privileges;