For a DD that specifies the base name of a GDG data set, indicating
a GDG ALL request, this text unit specifies the order in which the
individual generation data sets (GDSs) will be concatenated.
When you code GDGORDER, # must be one, LEN must be the length of
the PARM value (1), and PARM contains one of the following values:
- x'80'
- USECATLG – the GDS concatenation will be ordered as specified
in the GDG data set catalog entry.
- X'40'
- LIFO – the GDS concatenation is ordered with the newest GDS defined
first and the oldest GDS last. This is the default behavior when FIFO
or LIFO is not specified on the IDCAMS utility when defining the GDG
data set, and in releases prior to z/OS V2R1.
- X'20'
- FIFO – the GDS concatenation is ordered with the oldest GDS defined
first and the newest GDS last.
Example: To specify that the GDSs of a GDG data set request
be allocated with oldest data first, code:
Key # LEN PARM
802E 0001 0001 20
