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 115
Figure A-6 Horizontal versus vertical elapsed load times
Elapsed times for queries are shown in Figure A-7. As you can see, the variance between the
vertical and horizontal was greatest for the mixed-path setup-- a variance of 20%. This was
due to the fact that some of the arrays only had single paths defined, which created a
bottleneck for all data partitions in the horizontal layout (as opposed to affecting a sub-set of
the partitions for the vertical layout). When an equal number of paths were defined for every
array participating in the test, then the variance went down to 2% or lower.
Figure A-7 V
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