What is JES?Explain in detail about JES?
What is the difference between JES2 and JES3?

Questions by medamahendra   answers by medamahendra

Showing Answers 1 - 6 of 6 Answers

Jes stands for Job entry subsystem.

it does 2 major things
1. manages batch jobs.
2. Routes output to the terminal nodes.

difference between the two

Jes2 is a De-centralized network.
Jes3 is Centralized.

In a centralised system, a group of computers are assigned jobs through a central computer.
In a decentralised system, each computer acts independently in its selection of jobs.

Also Note that, between Jes2 and Jes3 there is NO advantage of one over the other

JES (Job Entry Subsystem) manages the jobs and resources. JES receives jobs into the system, schedules them for processing by z/os and controls their output processing.

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JES is a primary subsyatem and does the job management on behalf of MVS.
There are 6 phases in JES
1. Input phase
2. Conversion phase
3. Processing phase
4. Output phase
5. Print/punch phase
6. Purge phase
JES2 is descended from HASP (Houston Automatic Spooling Priority)
JES3 is ascended from ASP

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  • Sep 21st, 2011

JES2 allocates dataset required by the step just before
the step executes.

JES3 allocates datasets for all the step before scheduling the job.

monika samal

  • May 1st, 2012

JES2 processing is considered to be independently controlled.
JES3 processing is considered to be centrally controlled..

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santhosh s kumar

  • Feb 17th, 2013

JES2 in this it will release the resource after completion every step execution that resource can be used by any other user.

JES3 it will release the resource only after the completion of all steps execution no other program can access that resource util the completion of exec.

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