Take a look at the comparisons in the table below, but see the section on Speed below for an analysis of this data and the performance claims based upon it.
看一看下表中的比较，但是请阅读后面的速度部分，其中分析了这些数据和基于这些数据的性能表现。
2
Fragmentation and PDQ priority also have a huge effect on the speed of data retrieval and will help table scans.
分段和PD Q优先级也对于数据的检索速度有极大的影响，并有助于表扫描。
3
To achieve its exceptional speed, High Performance Unload reads directly from the DB2 table space containers instead of using the database engine when extracting, recovering, and moving data.