用户可以选择任意数量的记录并在一个操作中全部删除。
A user can select any number of records and delete an operation.
尽可能减少解决方案中此类操作的数量。
Wherever possible minimize the number of such operations in the solution.
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.
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