An abstract view of SOA depicts it as a partially layered architecture of composite services that align with business processes.
SOA的一个抽象观点将它描述为与业务过程结合在一起的合成服务的部分分层架构。
It is evident from Figure 7 that layered architecture is an extension of the MVC architecture.
从图7中可以明显看出，分层结构是MVC结构的一种拓展。
When there is a performance problem in this layered architecture, it often becomes difficult to get to the root cause. This is particularly true for DBAs.
当分层架构中出现性能问题时，往往很难找到根源，对dba来说尤为如此。
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