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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Chapter 1. Introduction to the ESS, DB2 UDB and AIX 7
As DB2 UDB is enhanced with new features and functionality, the optimizer performance
improves. An example is extending the optimizer to understand OLAP SQL extensions and
multiple levels of parallel query processing. The latter is particularly important in clusters
where each node is an SMP. IBM has also built into the optimizer knowledge about how to
work with underlying disk subsystems, such as the arrays of disks inside the ESS.
The optimizer takes advantage of its knowledge of the characteristics of the hardware
environment; CPU speed, I/O speed, network bandwidth (for federated queries), bufferpool
allocations. In addition, it knows the characteristics of the data itself: size of ...
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