Contributing

How do you create a base in GDG?

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How do you create a base in GDG?

Answer

  1. Create a GDG file.
  2. Create a model or template for the individual generations of data sets.
  3. As a test you can create your first generation of data sets by running this JCL example.
  4. Because the Apply or Capture log file is not referenced by a DD statement you must use IEBGENER to copy your app.

What happens if we provide +2 instead of +1 while creating a new generation?

Suppose, you have given (+2) in JCL instead of (+1), then, it creates (+2) generation. So, it jumps the generation number to 2. Since you have given as (+2), it creates (+2) generation after (0) generation.

How do I create a GDG base in TSO?

GDGs can be created using file-aid 3.2 in that use “G – Define generation data group” in option to allocate the base and then using “A” to allocate a generation. 1. Go to ISPF 3.2 panel….Look at his code.

  1. This piece of code creates the GDG Base for you.
  2. This piece of code creates the Model to be used for all versions.

What is the maximum number of GDG that can be created?

255
The maximum number of host GDG generations that you can reference is 255. MSS does not support versioning of the GDG generations, so the only generations that versioning works for are those with a data set name ending with V00.

What is GDG base in mainframe?

Defining GDGs in a JCL. Generation Data Groups (GDGs) are group of datasets related to each other by a common name. The common name is referred as GDG base and each dataset associated with the base is called a GDG version. GDG is the GDG base name.

Why do we need Joblib in JCL?

A JOBLIB statement is used in order to identify the location of the program to be executed in a JCL. The JOBLIB statement is specified after the JOB statement and before the EXEC statement. This can be used only for the in stream procedures and programs.

How do you refer to the current generation of a GDG?

Keep the same name for all datasets within a GDG. Generation number will be assigned by the OS when it is created. Generation(0) refers the current generation.

How do I refer to latest version of GDG?

4 Answers

  1. Add a IEBGENER step1a to create the GDG before step2, this should ensure the GDG is created.
  2. Add a cond to step 3. //step3 exec PGM=SORT,COND=(0,NE)
  3. Change disp to DISP=(,CATLG,CATLG), (if the step failed) //INP DD DSN=sample. test(+1), // DISP=(,CATLG,CATLG),

How can check GDG base properties?

How to see and read the properties of a GDG?

  1. In the ISPF command line, you can issue a command ‘TSO LISTC ENT(‘GDG-BASE-NAME’) ALL’
  2. Use LISTCAT ENTRY ‘GDG-NAME’ ALL in the IDCAMS utility of the JCL.
  3. Use a utility called Fileaid if your site supports Fileaid.

How many versions are there in GDG?

Each generation can have 100 versions. The system automatically maintains the generation number. The number of generations kept depends on the size of the generation index. For example, if the size of the generation index permits ten entries, the ten latest generations can be maintained in the GDG.

How do I open a GDG file in mainframe?

Go to INSYNC, then Utilities, Select Vsam option then give the GDG name there. It will show the Limit, whether it is scratch or empty etc…… using the LISTCAT option of IDCAMS can also serve the purpose.

How to create and use A GDG file?

Here is an example of how to create and use a GDG: 1. Create a GDG file. This JCL calling IDCAMS will do it. In this example LIMIT (15) is the number of generations you wish to create and keep. Of course, change the GDG file name to your requirements. 2. Create a model or template for the individual generations of data sets.

How to create GDG base in JCL?

GDG base can be created using IEHPROGM (explained in JCL utilities module) or using IDCAMS utility. Nowadays, IDCAMS is preferred utility for creating GDG base

How to create GDG base using IDCAMS?

Creation of GDG base GDG base can be created using IEHPROGM (explained in JCL utilities module) or using IDCAMS utility. Nowadays, IDCAMS is preferred utility for creating GDG base Below is an sample JCL creating GDG base using IDCAMS

How do I find the generation number of A GDG?

The generation number of a data set within a GDG is automatically assigned by the operating system when it is created. The syntax of the number is recorded by the system as follows: GaaaaVnn, where ‘G’ is for generation, ‘aaaa’ is the absolute sequence number of the generation, ‘V is for version, and ‘nn’ is the version number.

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