This configuration is more maintainable and more scalable since there is only a logical segregation and therefore each individual data element may be encrypted by a separate key.
Such segregation is important in a project context such as an SOA effort as it allows scoping down to the data sources that are important for analysis.
在诸如 SOA 之类的项目上下文中，这样的分离是很重要的，因为它允许将分析的范围缩小到对分析比较重要的数据源上。