On Fri, 1 May 2009 12:17:48 -0500, John McKown <joa...@swbell.net> wrote:
>On Fri, 1 May 2009 13:09:34 -0400, Bobbie Jo <just...@peoplepc.com> wrote: > >>"Does CA11 work ok with datacom?". >> >>Eventually, but what a pain in the neck that was to get working correctly at >>my previous place of employment. >>. >>Why c/a went with datacom is one of the great mysteries of the universe. >> >>Bobbie Jo Justice > >Perhaps for a number of reasons. The first is that it might be easier to >write reports using Datacom/AD (SQL based) than "binary" information in a >PDS. Most current programmers understand SQL better than any other "access" >method. The second is that Datacom/AD is an RDMS. It __may__ have better >error recovery and journaling than trying to do this in a PDS. An RDMS has >built in concurrency. > >Just some thoughts as to a possible reason why. I may ask my manager. He's >ex-CA and one original of the CA-11 developers. That is why the conversion >was "no big deal" to us. > I don't speak for CA, but I would say the biggest reason they went to Datacom is 24x7 availability. Compressing the PDS CMT for CA-11 or performing a REORG for the VSAM JEHF history file (after a purge for example) involves stopping production batch. That had become very intrusive over the last decade. The bigger the shop, the bigger the problem. We stuck with CA-11 2.0 for a long time because 3.0 didn't support any automatic fail over in a sysplex environment. Eventually the flavor of Datacom was changed to support "shadow MUF". It's still a pain since there can only be one backup system so operations has to pay attention to planned outages or move the backup MUF. But it works. We've had very few problems with CA-11 once we finally upgraded to 3.0. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:mark.zel...@zurichna.com z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
