分布式拒绝服务攻击并没有用来侵入后台数据库，这一攻击多用来阻止用户正常进入某些网页，或者阻止一些功能性服务的正常使用。
Although distributed denial of service attacks do not harm a database, they are generally carried out to prevent people having access to an Internet site or to prevent a service from functioning.
数据备份功能涉及到后台数据库操作，考虑到平台硬件和操作系统特性，系统没有采用DBMS，而是直接读写数据库文件。
As we considered the limit from platform and operating system, there's no DBMS included. On the contrary, we use direct database reading and writing.
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