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If your GDG base has 3 versions, and you want to concatenate all the 3 versions and use as input to a program in JCL, instead of mentioning all the 3 version names, you could just mention the GDG base name and the JCL would use all the versions in LIFO (Last In First Out) order

Suppose you have a GDG File (YOUR.GDG.FILE) has 2 versions as below.

YOUR.GDG.FILE.V01
YOUR.GDG.FILE.V02
YOUR.GDG.FILE.V03

To user all the versions with LIFO, you can either mention as below

//INPUT DD DSN=YOUR.GDG.FILE

Or as below

//INPUT DD DSN=YOUR.GDG.FILE.V03
// DD DSN=YOUR.GDG.FILE.V02
// DD DSN=YOUR.GDG.FILE.V01

IBM has introduced a new parameter GDGORDER in which you can mention the order of versions when using just the BASE.

//INPUT DD DSN=YOUR.GDG.FILE,GDGORDER=LIFO

Above is the default setting

Sometime you want read the first version of the GDG first and then with other versions in increasing order. In this case, you can define like.

//INPUT DD DSN=YOUR.GDG.FILE,GDGORDER=FIFO

Above is same as below

//INPUT DD DSN=YOUR.GDG.FILE.V01
// DD DSN=YOUR.GDG.FILE.V02
// DD DSN=YOUR.GDG.FILE.V03

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