Comparing Job Management Manager Detached Processes with OpenVMS Standard Batch Processes

An Overview of Job Management Manager › Comparing Job Management Manager Detached Processes with OpenVMS Standard Batch Processes

Comparing Job Management Manager Detached Processes with OpenVMS Standard Batch Processes

The manager offers both detached and batch processing. For many repetitive tasks, Job Management Manager detached processing can be easier to use than OpenVMS standard batch processing. The table below shows how detached processing and OpenVMS batch (without Job Management Manager) handle several common tasks.

Function	Job Management Manager Detached Process	OpenVMS Batch Process (without Job Management Manager)
Processing a single DCL command	Allows single DCL commands or command files.	Requires a command file.
Modifying a job record	Modifies and runs jobs repeatedly.	Jobs must be resubmitted.
Modifying job criteria	Separates criteria from the job itself; you can modify criteria without modifying the job.	The job and its criteria must be deleted, modified, and resubmitted.
Identifying file versions	Uses a file name. Runs the most current file version or the version you specify.	Uses an OpenVMS record management services (RMS) file identification. Runs the version that existed when the job was submitted, regardless of any new changes made to the file.

Here is a list of some tasks you can perform using the manager that you cannot perform using standard OpenVMS batch mode:

Override job settings for a single run
Synchronize multiple jobs on an OpenVMS Cluster
Specify failover actions for interrupted jobs
Access jobs by Motif interfaces
Specify prefunctions and postfunctions to perform before or after a job
Issue warning messages when a job exceeds the maximum run time or does not start when expected

For functions that involve timing between different nodes, such as maximum run time and start time for remote or batch mode jobs, system times must be synchronized.

Note: OpenVMS detached processes created by the manager carry the processing mode of OTHER for detached processes, or BATCH for batch processes. Before you run existing command procedures under the manager, change the test for F$MODE() .EQS. "BATCH", to:

IF F$MODE() .EQS. "BATCH" .OR. F$MODE() .EQS. "OTHER"

Batch mode further increases the versatility and usefulness of the manager. For a description of the manager, see Using Batch Mode in the chapter "How Job Management Manager Works."

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