Unicenter CA-Scheduler Job Management for VSE User Guide

5.1 Criteria Vocabulary
Given the example preceding, no matter what day it is, JOB1 and JOB2 will be
predecessors as long as they are in the day's workload. If it is Monday and
JOB2 happens to be in the workload for Monday, JOBC (the job being defined)
will have to wait for both JOB1 and JOB2 to complete.
Does this mean that Unicenter CA-Scheduler just makes one list of
predecessors for each job? Not at all. Rule #1 just applies to selection-defined
predecessors: jobs and schedules. Unicenter CA-Scheduler observes ORs used
with keyword-defined predecessors.
5.1.6 Affect of NOT Condition on Predecessors
The Boolean NOT expression affects selection just as you might expect:
selection only occurs when something else does not happen that day. For
example, if the criteria for JOBC is:
(MON AND NOT JOB1)
selection will occur only on Mondays when JOB1 is not selected.
How would predecessors be handled in the preceding example? If JOB1 for
some reason ends up in the workload (by a manual override), JOBC will wait
for it if JOB1 was added while JOBC was waiting for its start time to be
reached or other predecessors to be satisfied.
Another example will help reinforce this point. Consider this criteria statement
associated with JOBC:
(MON AND NOT (JOB1 AND JOB2))
This will cause selection to occur only on Mondays when both JOB1 and JOB2
are not selected. If either JOB1 or JOB2 is present, however, it will be a
predecessor of JOBC. This shows that Rule #1 applies even when using NOT
expressions.
The NOT expression is used only for selection purposes within the criteria
language.
5.1.7 Recommended Method for Defining Selection Criteria
Schedules are sets of related jobs grouped together in ways that are easily
understood by your production control area. So if production control thinks of
schedules as units of work, selection criteria would normally be defined at the
schedule level. If all jobs in a schedule run when the schedule is selected,
define when these jobs run once, on the schedule's criteria record which means
you only need to define predecessors at the job level. If a job does not run
every time its schedule runs, define its own individual selection criteria on the
job criteria record. Keep the following rule in mind when coding selection
criteria.
5-8 Unicenter CA-Scheduler User Guide