LIKE=a good representative existing library. > -----Original Message----- > From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On > Behalf Of David Crayford > Sent: Monday, February 27, 2023 9:53 PM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: zOSMF and zOWE for non-mainframers > > [EXTERNAL EMAIL] > > On 28/2/23 13:41, Gibney, Dave wrote: > > How many decades have we had System Determined Blocksize, and other > artifacts of SMS. These details are surely not anything than new folks need to > deal with at the outset. > > If a young programmer came to you and asked "what is the best DCB for a > C++ source data set?" what would you suggest? > > > > > >> -----Original Message----- > >> From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On > >> Behalf Of David Crayford > >> Sent: Monday, February 27, 2023 9:27 PM > >> To: IBM-MAIN@LISTSERV.UA.EDU > >> Subject: Re: zOSMF and zOWE for non-mainframers > >> > >> On 27/2/23 06:46, Andrew Rowley wrote: > >>> On 25/02/2023 8:03 am, Bob Bridges wrote: > >>>> Oh, I was going to mention that surely allocating datasets, either in > >>>> batch or TSO, has got to seem like one of the dumbest and most > >>>> incomprehensible things we do on the mainframe, to a foreigner. > >>> Allocating datasets shouldn't be that hard to grasp. "Dataset" is > >>> actually a pretty common term and generally implies a collection of > >>> data with more structure than just a file. > >> From what I've seen while working with younger individuals, they tend > >> to find the MVS file system quite perplexing. In order to navigate it, > >> one must first grasp the archaic concept of CKD disk geometry, including > >> blocks, cylinders, blocking factors, and record formats, among other > >> things. And that's all before even introducing them to the intricacies > >> of VTOCs, catalogs, interblock gaps, spanned record formats etc. > >> > >>> If people have worked with databases, presumably they have > encountered > >>> the concept of defining the schema. > >>> > >>> A dataset is simply a collections of records (similar to a database > >>> table) where each record has a fixed length or limited variable length > >>> and the total collection has a size limit. Any structure within the > >>> records is up to the application. This is not an unusual construct. > >>> > >>> What is unusual is that z/OS uses such a structured format for almost > >>> everything, not that it exists. > >>> > >> ---------------------------------------------------------------------- > >> For IBM-MAIN subscribe / signoff / archive access instructions, > >> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
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