Author: Robert Sample
Posted: Mon Jan 16, 2017 8:36 pm (GMT 5.5)
I don't think you've explained nearly enough for an accurate determination to be made. Your original post said that the oldest tape file's data will be dropped each month. How do you determine which records in the VSAM data set are to be dropped each month? If you have a way to determine that, then a VSAM KSDS makes sense. Otherwise, as I pointed out earlier, you'll need to rebuild the VSAM data set every month and that will DEFINITELY be less efficient than just processing the tape files directly.
There may be other reasons to build a VSAM data set from the tape data -- online processes or other batch jobs that need the data. Without knowing a lot of the specifics, it is not possible for us to say whether or not building a VSAM data set makes sense.
_________________
TANSTAAFL
The first rule of code reuse is that the code needs to be worth re-using.
"We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil." -- Donald Knuth
Posted: Mon Jan 16, 2017 8:36 pm (GMT 5.5)
I don't think you've explained nearly enough for an accurate determination to be made. Your original post said that the oldest tape file's data will be dropped each month. How do you determine which records in the VSAM data set are to be dropped each month? If you have a way to determine that, then a VSAM KSDS makes sense. Otherwise, as I pointed out earlier, you'll need to rebuild the VSAM data set every month and that will DEFINITELY be less efficient than just processing the tape files directly.
There may be other reasons to build a VSAM data set from the tape data -- online processes or other batch jobs that need the data. Without knowing a lot of the specifics, it is not possible for us to say whether or not building a VSAM data set makes sense.
_________________
TANSTAAFL
The first rule of code reuse is that the code needs to be worth re-using.
"We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil." -- Donald Knuth