The other LABEL statements must be specified and must be in incremental order. LABEL=01 in the first step is not required as it will default, but it makes the job look consistent. The REF=*.S1.SYSUT2 means use the same volume as was used in STEP S1, DDNAME SYSUT2.
You want the other steps to use that tape, but you do not know in advance what the tape is. When you allocate a tape to the first step, you mount a non-specific scratch tape. Within the VOL statement, the ,RETAIN keeps the volume on the drive,and the ,20 means the output can span up to 20 volumes. How do you stack datasets on a tape using JCL? If you want to copy several datasets to a single tape, you need to use a combination of label parameters and referbacks, and this can be quite complicated. Some tape management systems, TLMS for example, will not let you add a file to an existing tape, as it considered the tape as non-scratch, so you have to stack them all up in one job. So the job creates the file, writes data out to it, then deletes it! I once spend several hours in the middle of the night trying to work out why a job was not creating a file, when the problem was simply that I'd forgotten to add a DISP statement. The first parameter will default to NEW, but the second one defaults to DELETE! If you don't specify a disposition at all, the default is DISP=(NEW,DELETE,DELETE). Incidentally, if you are creating a new dataset, you must specify DISP=(,CATALOG) at the very least. SYSUT2 DD DISP=(,CATLG,DELETE),DSN=output dataset, It is using a dataclass to get the attributes for the output file. The example below shows IEBGENER at its simplest, to just copy a file.
It can also be used to convert sequential files to partitioned and partitioned to sequential. IEBGENER can only cope with record lengths up to 32760 bytes, longer records are truncated. IEBGENER is used for copying Physical Sequential files, and for copying members of Partitioned datasets or PDSEs. FDReport is a utility program that gets data from VTOCS and Catalogs.
0 kommentar(er)
