A job is the basic unit of work for the system. Job control language
(JCL) identifies a job to an operating system and describes the job's
resource requirements. The JOB JCL statement identifies a job's beginning
and contains such information as:
- Job name
- Job account number
- Job class
- Job priority.
Using job-related commands, you can start, stop, or cancel a
job. You can also modify a job's parameters and restart a job
that has failed. There are two kinds of jobs in the system: queued
jobs and jobs that are selected on demand. Queued jobs are managed
by JES. Jobs that are selected on demand (referred to as demand-selected)
are created as the result of START, MOUNT, and LOGON commands.