IBM manual VSE to OS/390 Migration Workbook

perform a DFSORT COPY function to copy the temporary data set back into the original SORTIN VSAM data set.

2. Sorting multiple VSAM data sets in the same step.

VSE SORTs allow multiple inputs through multiple SORTIN(n) DLBL or TLBL statements. DFSORT allows only one input to sort, the SORTIN DD statement. Through OS/390 JCL, multiple sequential data sets may be concatenated, but VSAM data sets may not be concatenated. A circumvention would be to use VSAM REPRO to copy the VSAM data sets to one or more temporary sequential data sets. Another circumvention would be to perform multiple sorts each using a single VSAM data set as input to each sort step and then perform a single merge to merge the data sets to produce a single sorted output file. Still another solution would be to write a sort exit that performs the input processing and passes the records to DFSORT.

132VSE to OS/390 Migration Workbook