I write a lot of code in REXX. I also like Perl, but rarely use it on z/OS. Anyway, I was just trying to think (hard on the lead in to a 3 day weekend in the states). Would I gain very much if I subset my input file using DFSORT instead of subsetting in my REXX code. My example in this is the output from IRRDBU00. That creates a "flat file" unload of the RACF database, which I use to write a report. I use the 0200 records. In my shop they account for less than 5% of the records in the file. Seems to me that using DFSORT to subset the data, even if only used once, would result in less CPU, I/O, and elapsed time. What say ye?
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