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ABCs of z/OS System Programming Volume 13 by Juha Vainikainen, Paul Rogers

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JES3 job flow and scheduling
JES3 job management consists of the following phases for jobs that go to MVS execution:
Input service
Converter/interpreter service
Resource allocation
Job selection and scheduling
Output service
Purge
Input service, the first phase of JES3 job management, reads MVS jobs and places each job into a queue for subsequent processing by other phases. These types of jobs include MVS batch jobs, started tasks, and TSO logons.
Another group of JES3 jobs consists of callable DSPs. These jobs include operator called ...

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