这种写入后延迟写入有几个好处，不仅仅是增加了用户对写入的响应时间。
This write-behind delayed-write has several advantages, even beyond the increased response time for the user on writes. The back-end database itself can be greatly offloaded and used more efficiently.
在正常的环境中，一个写请求是直接写入到缓存中而不会引起延迟的，因为它不需要访问物理磁盘。
Under normal circumstances, a write request is written directly to cache and incurs no delay because physical disk access is not required.
使用延迟的随机写操作，当内存中的页面数量超过指定的数量，则将所有后续的页面写入到磁盘。
With random write behind, the number of pages in memory exceeds a specified amount and all subsequent pages are written to disk.
应用推荐