November 2001
Intermediate to advanced
158 pages
5h 10m
English
Content preview from IBM ESS and IBM DB2 UDB Working Together
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Appendix A. Data placement tests 125
Keeping data and index separated
The following discussion presents a relevant question, and then offers our test design and
results.
Question
In the past it has been beneficial to separate data and indexes onto different physical disks.
The theory behind this being that the pattern of I/O activity was different and therefore placing
data onto separate physical disks from indexes allowed the disks arms to be better positioned
for the next I/O activity.
With the design of the ESS, this level of separation is not necessary. However, since the
question continues to arise, we decided to test this setup to see if it ...
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