填充因子是在创建新索引页时分配的可用空间的百分比。
The fill factor is the percentage of free space allotted when a new index page is created.
可用内存包含不同VM对象联系在一起任何地址空间物理内存的页。
The free list contains pages of physical memory that are not associated with any address space of VM object.
索引页上的可用空间量是很重要的，因为当索引页填满后，系统必须花时间拆分它，为新行腾出空间。
The amount of empty space on an index page is important because when an index page fills up, the system must take time to split it to make room for new rows.
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