This won't help with the main question, but it may give a sideways help. I blogged it in https://colinpaice.blog/2021/01/08/how-to-backup-only-key-data-sets-on-z-os/
*Using DFDSS to backup...* *The BY(DSCHA,EQ,YES) says dump datasets only if they have the "changed flag" set. The Changed flag is set when a data set was open for output. Using ADRDSSU with the RESET option resets the changed flag. This allows you to backup only data sets which have changed - see below.* Colin On Fri, 2 Aug 2024 at 18:17, Kirk Wolf <[email protected]> wrote: > How to do it efficiently is a really good question. Did you look to see > if DFDSS has a function to do that? If there were an IBM utility, I would > expect to find it there. > > Kirk Wolf > Dovetailed Technologies > https://coztoolkit.com > > On Fri, Aug 2, 2024, at 11:25 AM, Mike Schwab wrote: > > Future? I don't think so. How about an IDCAMS or TSOBATCH print > > COUNT(1) so you won't have to create any JCL. And z/OS doesn't read > > the whole file, so size will have little impact, just the files not > > big enough to fill the buffers will be a little faster.. > > > > On Fri, Aug 2, 2024 at 10:06 AM Billy Ashton > > <[email protected]> wrote: > > > > > > Hi friends! Here's another in the series of "Friday Foibles!" (Why > these > > > questions always come up on Fridays is beyond me!) > > > > > > We have a need to run a job that will perform a process like the Unix > > > touch command, so that the last access date of a file is updated. > > > > > > We don't want to do things like allocate, open, and print one record, > as > > > some of these files are huge (25-50GB). The list of files is somewhat > > > dynamic, and may change week to week. > > > > > > Does anyone have a job that will update the last access date for a list > > > of files, and ideally, set the last access date into the future a week > > > or two, to ensure that the files will not get archived (since I am not > > > sure we could easily recall some of them again)? > > > > > > Thank you and best regards, > > > Billy Ashton > > > > > > ---------------------------------------------------------------------- > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > send email to [email protected] with the message: INFO IBM-MAIN > > > > > > > > -- > > Mike A Schwab, Springfield IL USA > > Where do Forest Rangers go to get away from it all? > > > > ---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: INFO IBM-MAIN > > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
