On 10 February 2010 14:46, John R. Ehrman (408-463-3543 T/543-) <[email protected]> wrote: > PDSEs have been available for a long time, and provide many > advantages over PDSs. Why are people reluctant to use PDSEs?
It's a lot like VSAM catalogues 30-something years ago: There was a lot of discussion at SHARE and the like before they came out, everyone agreed there was a requirement, but what IBM came out with was quite different from what was expected and understood. Various system restrictions prevented their use in a number of common situations, and performance generally lagged the previous generation (CVOLs/PDSs). Then the level of bugs and usability issues dragged on way way too long, and in the case of VSAM catalogues, a whole new design eventually replaced the original, with a whole new set of rules, and a bunch of migration issues that continue to this day. PDSEs are ill-documented (not just proprietary code, but proprietary data formats!), fail catastrophically rather than gradually, don't play nice across systems, offer few advantages and new restrictions over PDSs. And by a remarkable coincidence, come from the same lab that invented VSAM catalogues. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
