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Job class characteristics z/OS JES2 Initialization and Tuning Guide SA32-0991-00 |
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During JES2 initialization, you can assign job characteristics
to jobs queued in each class to determine:
When first creating your initialization data set(s), you can define a “universal” job class statement and specifications. Define JOBCLASS(?) as a single JOBCLASS statement; it provides a “universal” set of characteristics for all 36 job classes. (The '?' wild-card character refers to the one-character job classes, as opposed to '*' which would include the 'STC' and 'TSU' classes.) Then add specific JOBCLASS(v) statements after this statement for those classes that require individual specification. JES2 overrides previously-defined initialization statements with duplicates of the statement it reads later in initialization processing. In this manner, only specific JOBCLASS(v) statements override their “universal” JOBCLASS(?) or JOBCLASS(*) specification and the “universal” characteristics remain valid for all other “non-specifically” defined classes. For example, in the following initialization statements:
Job class X overrides the previous value of AUTH=IO with AUTH=INFO, and the IEFUSO value (which defaulted to YES) is changed to NO. Job class X uses the values for MSGLEVEL= and PERFORM= from the JOBCLASS(?) statement. A default SCHENV can be specified for each JOBCLASS (not for JOBCLASS(STC) or JOBCLASS(TSU)). This value will be provided each job at the end of JCL conversion provided that a SCHENV has not already been associated with the job. A SCHENV can be associated by the user specifying SCHENV= on the // JOB statement or by JES2 installation exits which occur before the end of conversion. SPINNING of JESLOG data sets is specified by the JESLOG operand. Jobs are assigned to JES2 or WLM managed initiators based on the
MODE parameter on the JOBCLASS statement. JES2 and WLM initiators
select jobs using different criteria:
Note: All JOBCLASS parameter definitions are MAS-wide, and
can only be changed with an operator command or a JES2 cold start.
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