Within the scope of work that is defined through inclusions and exclusions of job names and programs, the scope can be further drastically reduced by using the TOP Scope facility. This facility identifies the job steps consuming the greatest resources and limits the measurements to this group.
To define the use of the TOP Scope, there is only one parameter. This parameter is called TOP Scope of important steps and may contain a value from 0 to 99999. A value of 0 indicates that statistical alerts are disabled. In all other cases, the TOP Scope defines how many important job steps should be statistically observed.
The TOP Scope results are generated at least once a day under job step APCBAALM of job APCXJLIB or optionally after changing the TOP Scope through the online dialog. To figure out the TOP Scope, Performance Management Assistant computes the importance of a job step by using the following algorithm:
importance = log2 (srvu) + log2 (# of executions per month) + log2 (elpsd)
Based on the results of this computation, the importance is computed for each job step of the job file and a limited number of the top most important steps are flagged. To review the results, simply select the TOP method of the Job Query Facility panel.
The importance formula is equivalent to the product of service units, the number of executions, and elapsed time.
The TOP Scope method uses the imp formula to select the top resource-consuming job steps up to the limit set in the TOP Scope=nnn parameter. Statistical alerts and measurements are limited to the members of this group of large consumers.
The TOP Scope can be used to control
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