But who has the responsibility? This seems something that a system programmer, with some good analysis tools, should do. Or the system itself should be such that it can do it's own analysis. After all, is that not what computers are for?
Frank >________________________________ > From: John Gilmore <[email protected]> >To: [email protected] >Sent: Friday, February 17, 2012 5:21 PM >Subject: Re: Archaic allocation in JCL (Was: Physical record size query) > >Frank Swabrick wrote: > ><begin snippet> >| No, I'm not expecting a real answer to that question. >| Just trying to point out why it's hard, to say the least, >| to know how to size files of this type. ></end snippet> > >The question itself has not been very well formulated. > >No one, I hope and suppose, sizes files directly in cylinders, tracks >or megabytes. These are derived quantities. One begins with record >types, their individual sizes, and their expected volumes/counts. > >Initially one has only estimates, often poor ones, of >transaction/processing volumes, but these estimates can be improved >incrementally by collecting statistics of the volumes actually >experienced during processing and then analyzing these data.. > >That this is not much done does not been that it cannot or should not >be done. > >Adequate capacity planning and even many design decisions are >impossible without the systematic collection and analysis of such >information. > >John Gilmore, Ashland, MA 01721 - USA > >---------------------------------------------------------------------- >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
