JES3 Technical Overview

This course introduces the functions and facilities of JES3. The course teaches the capabilities of JES3. The course also describes and explains the operation, initialisation and diagnosis of a JES3 environment.


On successful completion of this course you will be able to:

  • list the differences between JES2 and JES3
  • describe the JES3 operating environment
  • describe the JES3 command structure
  • follow job flow in the JES3 environment
  • identify the important initialisation and tuning issues
  • use JES3 diagnostic facilities.

Who Should Attend

This course is intended for systems programmers and senior operations personnel in an organisation using JES3.


Attendees should have an understanding of job flow fundamentals in an MVS environment and a good working knowledge of JCL.


2 days

Fee (per attendee)

£875 (ex VAT)

Course Code




Objectives; History; Why JES3?; Terminology; Dynamic System Interchange; STARTUP; Devices; Multiple Console Support; Which commands from which console?; Where are Consoles defined?; Staging areas; Console Address Space Communication; Staging areas; Topic review.

Job Flow

Objectives; Job Flow; Processes; Input Service; Input Service; IS EXITS; CI Processing; CI Exits; Main Device Scheduler; GMS; Output Service; Output Service Exits; Purge; Dynamic Support Programs; DSP Recovery; Dependent Job Control; Remote Job Processing (RJP); Network Job Entry (NJE); Segment Review Questions.

JES Comparison

Objectives; JES purpose; JES3 features; JES2 features; Sysplex; Sysplex Coupling; Sysplex concepts.


Operations - general; Inquire on:Job Status and Job Queues, Console Status, Device Status, Output Queue Status, GMS options, MDS Queues, Any Other Business; Modify: Job and Job Queue status, Console environment, Vary, Output Queues, GMS options, MDS (setup) options, any other business; Control of Global Functions; Control of Writers; Segment Review Questions.

Initialisation & Tuning

Objectives; IPL parameters; JES3 procedures; Defining processors; Devices; Job Class; Job Class example; Groups; Select Mode; Output service; Functional Subsystems; External Writers; Output Exits; Writer Selection Parameters; Spool partition; Standards; Sysout; Spool: data set definition, data set formatting, file types, size allocation, Management, Buffers, SYSIN Management, SYSOUT Management; Segment review questions.

Diagnostic Facilities

Failsoft; FSWA; Dump Core DSP; CBPRINT tool; Register usage.

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