物理层：考虑数据如何被物理的磁盘子系统上，利用索引，分区和视图。这一层的改变不会影响到数据，只是影响到数据被如何保存到磁盘上。 范围从简单的、小的（小于20Gb）、到复杂的包含了多个文件组，索引的视图和路由分区。
Physical Layer: The implementation phase considers how the data will be physically stored
on the disk subsystems using indexes, partitioning, and materialized views. Changes made to
this layer won’t affect how the data is accessed, only how it’s stored on the disk.
The physical layer ranges from simple, for small databases (under 20Gb), to complex, with
multiple filegroups, indexed views, and data routing partitions.
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