Before a job is submitted, a job check is done with 'Job Attributes. Select' (MNS230) to retrieve job queue and the settings for confirmation to start the job. The settings are maintained in 'Job. Connect Job Queue' (MNS310) and could be set by specific job, user or user group, where the search sequence is:
Settings in MNS310
|Job queue||This field indicates the queue in which the job is put for execution in a batch.|
|Priority||This field indicates what priority the job should have in the job queue. Valid priorities are 1-9, where 1 is the highest priority.|
|Confirm job start||
0 = No, you do not need to confirm the start of a batch job.
1 = Yes, you must press Enter to confirm the start of a batch job.
2 = Yes, buttons for Yes, No or Cancel are displayed.
3 = Yes, a password is used to confirm the start of a batch job.
For alternatives 1-3, a count is performed based on the selection. The result (number of posts) is presented in a confirmation window.
For alternative 0, a check is made against "Number of selected records limit" and "Number of selected records notification" (see descriptions below). If the limits are exceeded, the job cannot be started.
|Save job history||
Select the check box to update the job history file for jobs that were successfully executed.
Jobs that are in the job queue, or jobs that ended abnormally, are always updated in the job history file regardless of this setting. The job history file can be monitored in 'Job. Display History' (MNS320).
|Number of selected records limit||This field indicates the limit for the number of records that are allowed in a selection. If the field is set to zero, there is no limit.|
|Number of selected records notification||This field indicates the limit for the number of records that will trigger a selection size notification. If the field is set to zero, there is no limit. A notification will only be issued if no other confirmation alternative has been set for the job.|
When the job is submitted, a record is written to a table that controls the execution of the batch, the Job Control file (CJBCTL.) The CJBCTL manages the administration of the submitted jobs and controls and monitors the execution on the highest level.
A second table, the job command file (CJBCMD) holds details about the job, as to what program to execute and other settings. This file controls the detail execution in the batch environment and may hold the settings/parameters for selection of data, job control information, execution information and printing information. Several records may be created for each job in the file CJBCMD. Not all information is needed for every job.
When a job is submitted, batch job manager (CMNGJOB) is in command and controls the execution.
CMNGJOB tries to start the submitted jobs. To control this process one or several job queues are supplied for execution of the jobs. Each queue has a maximum limit for the number of jobs that are allowed for parallel execution, to avoid overloading the batch processor. This is set in 'Job Queue. Open' (MNS300).
For further information on job queue management, see Manage job queue in this document.