On Thu, Jan 28, 2016 at 6:01 PM, Farley, Peter x23353 < peter.far...@broadridge.com> wrote:
> Is it Friday yet? Well, just a bit early. > > I remember those ISAM days all too well. Our solution to large ISAM > insert jobs was "update in reverse", i.e., sort the input in descending > ISAM key order and process from high to low. That was many times faster > than inserting in ascending key order due to the way ISAM updated its index > records. > > I also remember hating VSAM files because they had to be cataloged in > "VSAM Catalogs". Imagine that nonsense, do they think I don't already know > where I put my files? Why, they are right there on my dedicated removable > 3330-II packs! Everyone knows that! Besides, what's wrong with the OS > catalog we already have? Now I have to have a separate "VSAM" catalog > too? Harrumph! And what is this idiot IDCAMS utility I have to use now? > Isn't JCL good enough for them either? Double Harrumph! > I will rant about my "favorite" in the original VSAM: suballocating clusters. No VTOC entry, other than for the VSAMDSET(?) which would then contain _all_ the data for clusters on the volume inside of it. And where the data actually was within that "space" (the "extent" information) was in the VSAM catalog (IIRC). Oh, and a single volume could only be "owned" by one single VSAM catalog. So, at least for me, that meant one volume was dedicated to a single HLQ. > > But anyway Radoslaw is right, it seems there are some who would prefer no > change at all. I tend to be in the "modern" group myself. > Myself, personally, stay "current" (as current as I can, at least). But for production I stay at "n-1", or maybe about a year in the past. I don't want to debug IBM's code. That may be why I don't hate PDSEs like some here do. I didn't get on board early. Perhaps because I remember installing DFEF when it first came out. Curiously, this does not stop me from being "bleeding edge" on my Fedora Linux system at home. > > Peter > > -- Werner Heisenberg is driving down the autobahn. A police officer pulls him over. The officer says, "Excuse me, sir, do you know how fast you were going?" "No," replies Dr. Heisenberg, "but I know where I am." Computer Science is the only discipline in which we view adding a new wing to a building as being maintenance -- Jim Horning Schrodinger's backup: The condition of any backup is unknown until a restore is attempted. He's about as useful as a wax frying pan. Maranatha! <>< John McKown ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
