Explain what you mean by Generation data group (GDG).

1.	Explain what you mean by Generation data group (GDG).
Answer» Generation Data Group (GDG) is an important concept in JCL. GDG consists of groups of RELATED data sets arranged chronologically. Each of these related sets shares a unique name. A generation number and a version number are added to the end of the name of each data set within a group to make it unique. Syntax: ABC.PQR.XYZ.GnnnnVmm Here, the GDG BASE is ABC.PRQ.XYZ. G represents the Generation number (Value range 0000 – 9999), and V represents the Version number (Value range 00 – 99). Example: MYLIB.URMI.SAMPLE.G0001V00MYLIB.URMI.SAMPLE.G0002V00, and so on. Here, the GDG base is MYLIB.URMI.SAMPLE.

Answer»

Generation Data Group (GDG) is an important concept in JCL. GDG consists of groups of RELATED data sets arranged chronologically. Each of these related sets shares a unique name. A generation number and a version number are added to the end of the name of each data set within a group to make it unique.

Syntax:

ABC.PQR.XYZ.GnnnnVmm

Here, the GDG BASE is ABC.PRQ.XYZ.

G represents the Generation number (Value range 0000 – 9999), and V represents the Version number (Value range 00 – 99).

Example:

MYLIB.URMI.SAMPLE.G0001V00MYLIB.URMI.SAMPLE.G0002V00, and so on.

Here, the GDG base is MYLIB.URMI.SAMPLE.

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