March 2004
Intermediate to advanced
440 pages
11h 46m
English
book
DB2 UDB V8 and WebSphere V5 Performance Tuning and Operations Guide
by Whei-Jen Chen, Peter Z He, Kang Yong Ying, Andreas Paulsen, Sunminder S Saini
Content preview from DB2 UDB V8 and WebSphere V5 Performance Tuning and Operations Guide
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178 DB2 UDB V8 and WebSphere V5 Performance Tuning and Operations Guide
method response time. Given the nature of this statistic type, it is also used to
track non-time related counters, like average read and write size. You can always
call the getUnit
method on the data configuration information to learn the unit for
the counter.
In order to reduce the monitoring overhead, numeric and stat data are not
synchronized. Since these data track the total and average, the extra accuracy is
generally not worth the performance cost. Load data is very sensitive; therefore,
load counters are always synchronized. In addition, when the monitoring level of
a module is set to max, all numeric data are also synchronized to guarantee
accurate values.
6.1.3 ...
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