If the data set is cataloged, you need to supply only the following
information in the DD statement:
- The name of the data set (DSNAME parameter). The operating system
will locate the information describing the data set in the system
catalog, and, if necessary, will request the operator to mount the
volume containing it.
- Confirmation that the data set exists (DISP parameter). If you
open the data set for output with the intention of extending it
by adding records at the end, code DISP=MOD; otherwise, opening
the data set for output will result in it being overwritten.
If the data set is not cataloged, you must additionally specify
the device that will read the data set and, direct access devices,
give the serial number of the volume that contains the data set
(UNIT and VOLUME parameters).
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