How Job Management Manager Works › How Job Management Manager Processes Jobs

How Job Management Manager Processes Jobs

By default, the manager runs a job as a detached process on OpenVMS. The manager is activated by one of two actions:

• An internal timer starts the job at its scheduled starting time, except as restricted by dependencies, Special Days, or resource availability.
• The manager receives a message to look at a particular job. The message may be the result of a Job Management Manager command (such as Create, Modify, or Run), or a completed job.

By default, the manager does not use OpenVMS batch processing to run jobs. The manager creates the job process directly.

The process created by the manager first executes the system-wide and user-specific login command files. Then it executes the command file SCHEDULER$SHELL.COM supplied with the manager, in the NSCHED$: logical directory.

SCHEDULER$SHELL.COM runs a program that extracts the job’s commands from the Job Management Manager database and performs them. When the process created by the manager exits, OpenVMS sends a completion message to the manager. The manager then updates its job database accordingly.