用更新的方案来升级用户数据库。

Upgrade user database with the updated schema.

youdao

如果应用程序可以根据需要增加用户数、升级用户需要的功能并可根据需要将新功能添加到应用程序中，则应用程序具有可维护性。

If an application can increase the number of users as needed, upgrade the features that users need, and add new features to the application as needed, then the application is maintainable.

youdao

如果可以不支持，我们如何鼓励IE6的用户升级？

And if yes, how can we prompt IE6 users to upgrade?

youdao