JOB statement gives the job identity to the Operating System (OS) in the spool and the scheduler. It is the first control statement in a JCL. The available parameters in the JOB statement help the OS in allocating the right scheduler.
Índice de contenidos
Which statement tells the operating system how do you process a job?
The statement, which holds the job step program/procedure information is the EXEC statement. The purpose of the EXEC statement is to provide required information for the program/procedure executed in the job step.
What is Job Control Language in operating system?
Job control language (JCL) is a scripting language executed on an IBM mainframe operating system. It consists of control statements that designate a specific job for the operating system. JCL provides a means of communication between the application program, operating system and system hardware.
What is JCL and why it is used?
Job control language (JCL) is a set of statements that you code to tell the z/OS® operating system about the work you want it to perform. Although this set of statements is quite large, most jobs can be run using a very small subset. … One or more DD statements to identify the input and output data sets.
What uniquely identifies a JCL statement?
JCL statements are coded in 80-byte records. … Every JCL starts with a Job Card. The JOB Card contains the Job name which identifies the name of the job. The JOB name in most of the cases are unique but it is not necessary to give a unique name.
How many DD statements are in a step?
You must code one DD statement for each data set that is used or created within a job step. The order of DD statements within a job step is not usually significant.
Which parameter provides the storage specification of a job step?
The Data Control Block (DCB) parameter details the physical characteristics of a dataset. This parameter is required for datasets that are newly created in the job step. LRECL is the length of each record held within the dataset.
What is the function of the command jobs?
The jobs command displays the status of jobs started in the current terminal window. Jobs are numbered starting from 1 for each session. The job ID numbers are used by some programs instead of PIDs (for example, by fg and bg commands).
How do you write JCL?
Procedure
- Allocate a data set to contain your JCL. Use ISPF (or equivalent function) to allocate a data set named. …
- Edit the JCL data set and add the necessary JCL. …
- Submit the JCL to the system as a job. …
- View and understand the output from the job. …
- Make changes to your JCL. …
- View and understand your final output.
What does Msglevel 1 1 mean?
• The default is MSGLEVEL=(1,1) • Used to specify the JCL messages and allocation messages which will be recorded on the output device specified in MSGCLASS.
Why is JCL used?
More specifically, the purpose of JCL is to say which programs to run, using which files or devices for input or output, and at times to also indicate under what conditions to skip a step.
How can an abnormally terminated job be started again?
If a job terminates abnormally, the checkpoint/restart facilities allow you to restart the job, as follows:
- Automatic step restart, that is, restart by the system from the beginning of a job step.
- Automatic checkpoint restart, that is, restart by the system from a checkpoint within a job step.
What are the three types of JCL statements?
All jobs require the three main types of JCL statements: JOB, EXEC, and DD.
What is message class JCL?
MSGCLASS parameters used to describe where the JCL messages routed. In other words, it is used to assign an output class for output listing (SYSOUT). … MSGCLASS can be useful to hold the system messages output after JOB execution completed. MSGCLASS is related to a specific output device.
How do you call a proc in JCL?
The varying part of the Job is coded within the JCL. You can use a procedure to achieve parallel execution of a program using multiple input files. A JCL can be created for each input file, and a single procedure can be called simultaneously by passing the input file name as a symbolic parameter.
What is a job personal statement?
What is a personal statement? A personal statement, also known as a personal profile, summarises what you can offer an employer in relation to the job you’re applying for. “It needs to convince your audience that you’re a good fit for the role in hand” says McGuire, Founder of Giraffe CVs.
