JES is the component of the operating system that provides supplementary job management, data management, and task management functions such as scheduling, control of job flow, and the reading and writing of input and output streams …

What is a JES? Why is JES required in an MVS™ system? What is the relationship between JES and the system users? Is there really any difference between JES2 and JES3? What are some of JES2's key functions?

The Job Entry Subsystem (JES) is a component of IBM's MVS (MVS/370 through z/OS) mainframe operating systems that is responsible for managing batch workloads. In modern times, there are two distinct implementations of the Job Entry System called JES2 and JES3. They are designed to provide efficient execution of batch jobs.

What is a JES? MVS uses a job entry subsystem (JES) to receive jobs into the operating system, schedule jobs for processing by MVS, and control job output processing.

2024年12月12日 · 对于ibm s390系列大型机的操作人员和管理员来说，掌握jes命令是非常重要的。 它直接关系到作业的执行效率和系统的稳定性。 通过对JES命令的深入理解和应用，操作人员可以更有效地监控作业执行过程、解决作业执行中出现的问题，并且实现作业流的优化。

This document describes the application programming of JES2 and JES3. It provides the information that you need to: This document is intended for JES2 and JES3 application programmers who are using spool data set browse, server/client print interface, internal reader, and external writer.

IBM ® provides two kinds of job entry subsystems: JES2 and JES3. In many cases, JES2 and JES3 perform similar functions, but most installations use JES2. Both JES2 and JES3 read jobs into the system, convert them to internal machine-readable form, select them for processing, process their output, and purge them from the system.

MVS™ uses a job entry subsystem (JES) to receive jobs into the operating system, schedule jobs for processing by MVS, and control job output processing.

For useful work to be performed on z/OS®, SYS1.PROCLIB must contain a job procedure for the primary job entry subsystem. To initialize JES, the master scheduler subsystem looks in SYS1.PROCLIB for the JES cataloged procedure.

What do you need to know to be a good JES2 Systems Operator? How JES2 works & why it needs an operator. See what’s going on, what’s wrong, & how to fix it. Poly-JES, Automation, ... Help your operations staff learn the power and pitfalls of JES2 commands, understand the rich messages, and efficiently manage your JES2 subsystem.