What is instream data?
Table of Contents
- What is instream data?
- What is instream procedure in JCL?
- How do you access a file that had a disposition of KEEP?
- Is overriding possible in catalog procedure?
- How do you write instream data in JCL?
- Why is the concept instream data used for?
- What is difference between instream and cataloged procedure?
- What is cataloged procedure?
- What is the difference between disp old and DISP SHR?
- What disposition is needed to retain the file on the disk?
- Can a SYSIN statement be coded in an instream procedure?
- Can you code an instream procedure within a cataloged procedure?
- How to reuse the JCL code in instream?
- What's the maximum number of instream procedures you can use?
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 instream procedure in JCL?
When the procedure is coded within the same JCL member, it is called an Instream Procedure. It should start with a PROC statement and end with a PEND statement. ... The parameters DSNAME and DATAC can be coded with different values while calling the procedure and these are called as symbolic parameters.
How do you access a file that had a disposition of KEEP?
6. How do you access a file that had a disposition of KEEP? Need to supply volume serial no. VOL=SER=xxxx.
Is overriding possible in catalog procedure?
You can override any parameter in a cataloged procedure except the PGM= parameter in the EXEC statement. Overriding of statements or fields is effective only for the duration of the job step in which the statements appear. The statements, as stored in the procedure library of the system, remain unchanged.
How do you write instream 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. Two records of data are passed to the program.
Why is the concept instream data used for?
The term “In-Stream Processing” means that a) the data is coming into the processing engine as a continuous “stream” of events produced by some outside system or systems, and b) the processing engine works so fast that all decisions are made without stopping the data stream and storing the information first.
What is difference between instream and cataloged procedure?
1. Instream Procedures: Instream procedures are identical to cataloged procedures except that you place them right along with the job in the input stream, immediately following the JOB statement, rather than as members of partitioned data sets.
What is cataloged procedure?
A cataloged procedure, like an in-stream procedure, is a named set of job control statements. However, these control statements are placed, or cataloged, in a partitioned data set (PDS) or partitioned data set extended (PDSE) known as a procedure library. This enables a cataloged procedure to be invoked by any job.
What is the difference between disp old and DISP SHR?
What is the difference between specifying DISP=OLD and DISP=SHR for a dataset? DISP=OLD denotes exclusive control of the dataset; DISP=SHR means there is no exclusivity.
What disposition is needed to retain the file on the disk?
KEEP is the only valid disposition for VSAM files. This is to be used only for permanent datasets.
Can a SYSIN statement be coded in an instream procedure?
You cannot code instream data in a PROC.In order to overcome this limitation,one way is to code SYSIN DD DUMMY in the PROC, and then override this from the JCL with instream data. DSN SYSTEM (....) PLAN (.....)
Can you code an instream procedure within a cataloged procedure?
We cannot code an instream procedure within a cataloged procedure. In the above example, the JCL calls the procedure INSTPRC1 in JSTEP1 and procedure INSTPRC2 is being called within the procedure INSTPRC1. Here, the output of INSTPRC1 (SORTOUT) is passed as input (SORTIN) to INSTPRC2.
How to reuse the JCL code in instream?
Using instream / cataloged procedures we can reuse the jcl code which was stored in another data set, in our data set. Syntax for Executing procedure --> EXEC [PROC=]procedure-name INSTREAM PROCEDURE A JCL Procedure is a pre-written segment of code, that you can include in your JOB.
What's the maximum number of instream procedures you can use?
The maximum number of instream procedures you can in any job is 15. CATALOGED PROCEDURES Pre-written segment of code (which is stored as an member of PDS), which you can use as many times you want in any job in the system.