In many cases, a separate disk access must be made to fetch the page for each row located through an index.
大多数情况下，对于通过索引定位的每一行，都必须进行单独的磁盘访问来读取该页。
DB2 row compression was designed to reduce disk storage space requirements of database objects.
DB 2行压缩被设计用来减少数据库对象的磁盘存储空间需求。
DB2 row compression features can decrease disk storage requirements while at the same time improve sequential read access of large queries which perform full table scans.
DB 2行压缩功能可以减少磁盘存储需求，同时改进执行全表扫描的大量查询的顺序读取访问。
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