block paging

基本解释

In a virtual storage system, a fixed-length block of contiguous virtual addresses copied as a unit from memory to disk and back during paging operations.
在虚拟存储系统中，一个固定长度的连续虚拟地址块，在分页操作过程中它作为一个单位在内存和磁盘之间来回复制。
Paging a memory block out and back in from disk is significantly slower than accessing it directly from RAM, so you should generally avoid this practice.
与直接访问 RAM 中的内存块相比，把内存块交换到磁盘并交换回来要慢得多，所以一般情况下应该避免这种做法。
Applications like Web catalogs, multi-page sales reports and others make extensive use of paging, fetching a new block of data for each new page displayed.
诸如 Web 目录、多页销售报告之类的应用程序都大量使用分页，为显示的每个新页面抓取一块新的数据。