Introduction to z/OS 2.2 and z/OS 2.3

With z/OS 2.2, IBM introduced JES2 Job Execution Control (JEC) and JES2 deadline scheduling. z/OS 2.3 introduced dynamic job sequencing, allowing BEFORE and AFTER relationships on the SCHEDULE statement outside of job groups.

ThruPut Manager has offered similar facilities since 1995. ThruPut Manager is control- ling batch job dependencies using Dependent Job Control (DJC) and is providing deadline scheduling capabilities through Job Timing Services (JTS) and Job Chaining Services (JCS). JES3 compatibility is provided through NET and JES3 features of ThruPut Manager.

Functionally, the dependent job controls provided by IBM z/OS and ThruPut Manager are quite similar. In both cases, this is a facility that can be used to group a number of jobs and define dependencies between jobs that belong to the group.

The next section is a comparison between JES2 Job Execution Control (JEC) and Dynamic Job Scheduling with ThruPut Manager Dependent Job Control (DJC) and deadline scheduling capabilities.

It highlights the substantive differences between the two approaches, under the following topics:

  • Dynamic Group Definition
  • Simple Dependencies
  • Conditional Dependencies
  • Treatment of Unsatisfied Dependencies
  • Group Display Commands
  • Scheduling Parameters: WITH, HOLDUNTIL, and STARTBY
  • Group Affinity
  • Concurrent Jobs
  • JES3 Capabilities

It also identifies other z/OS 2.3 functionality that is supported.

This section provides information about the following topics:


 

Tip: For faster searching, add an asterisk to the end of your partial query. Example: cert*