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 3. Configuration for performance and manageability 43
Figure 3-2 Table space configuration parameters
Page size, Extent size and Prefetch Size were discussed previously in “Selecting DB2 logical
sizes” on page 33. Following are descriptions of the other required parameters.
Overhead and transfer rates
DB2 UDB defines two parameters related to I/O operational performance: overhead and
transfer rate. These parameters are taken into account when making optimization decisions,
and help determine the relative cost of random versus sequential accesses.
Overhead
OVERHEAD, which provides an estimate (in milliseconds) of the time required by the ...
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