What is in stream data in JCL?

Instream data to a program can be specified using a SYSIN DD statement. In Example 1, input to MYPROG is passed through SYSIN. The data is provided within the JCL. DATA is a PS file, which can hold one or more records of data.

What is Sysin in mainframe?

SYSIN card is used to send vast input data to the program using the JCL. Data can be accepted in the program through ACCEPT statement. One row in the SYSIN will be equal to one ACCEPT in the program. /* known as delimiter and by using /* we can end the instream data. Delimiter (/*) is mandatory with SYSIN.

What is Sysin DD dummy in JCL?

The dummy parameter is coded in DD statement to test the execution of a program without actually reading or writing a dataset. The OS actully simulates the presence of dataset.

Can you code instream data in procedure?

You cannot use instream data inside a PROC. It is a rule. Instead, you code some dummy statement inside the PROC and override the particular step’s DD statement from the JCL before you execute it.

What is instream data?

An in-stream data set is a data set contained within a set of JCL statements. In-stream data sets (also called inline data sets) begin with a DD * or DD DATA statement. These DD statements can have any valid ddname, including SYSIN .

What is link and XCTL and explain its difference?

Link is used to go from one module to another and then return to the first module such that the link to a module is used to provide the first some data. Whereas XCTL is used to go from one module without a need to return to the first module.

Why dummy is used in JCL?

Use the DUMMY parameter to specify that: No device or external storage space is to be allocated to the data set. No disposition processing is to be performed on the data set. For BSAM and QSAM, no input or output operations are to be performed on the data set.

What is the purpose of DD dummy statement in JCL?

DD statement IN1 defines a dummy data set. The DCB parameter supplies data control block information not supplied in the program. Without it, the step might be abnormally terminated.

How many instream procedures can a JCL has?

Note: The maximum number of in-stream procedures you can code in any job is 15.

Can we code Sysin DD * In Proc?

However, SYSIN DD * can not be coded as part of a proc.

What is Sysprint DD Sysout =*?

The SYSPRINT DD statement defines the output data set containing the end-of-step reports and any error messages. Normally it defines a SYSOUT data set. If the SYSPRINT DD statement is not in the JCL, the output of SYSPRINT is dynamically allocated to the default SYSOUT class—normally MSGCLASS.