Interview 在即，请做database 的大拿们出谋献策

下列是这个公司的description.他们做data driven web application.
我的问题是，我感觉这是个中型size的database application.这种database application最主要和常见的问题是什么？根据这个描述，我应该提什么样的问题呢？

We currently have over 50 custom web applications accessing over 70 databases through approximately 40 web services. The multi-tiered web applications are used by customers well such as the AAA System, which manages and sells over 10,000 XXX permits and over 40,000 special events and temporary permits per year resulting in millions of dollars in revenue; the BBB application, which allows over 11,000 registered customers to make over 10,000 reservations per year; and the CCC which allows Management to track the usage of every resources. Our work order system tracks 50,000 work orders per year resulting in over forty million dollars billed.


万分感谢！