为了使索引发挥最优性能，索引应该位于以10,000 R PM或者更快速度旋转的非系统硬盘上。

For maximum indexing performance, the index should reside on a nonsystem disk that rotates at 10,000 RPM or greater.

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当从硬盘驱动器读写表和索引数据时，DB 2使用缓冲池来缓存它们。

DB2 USES buffer pools to cache the table and index data as they are being read or written to the hard disk drive.

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简单的DCP可能存储在不止一个移动介质上(比如，复合式硬盘？)。这个索引文件用于识别整个DCP里的文件顺序。

A single DCP may be stored in more than one medium (e.g., multiple hard disks). This file is used to identify the volume order in the series.

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