For the record, the in-storage database was not huge, but this was the late 1970s, so all resources were dearer in those days. The RYO database was ingenious but primitive. It was based believe it or not on a set of PO data sets accessed via BDAM (!). The decision to go all memory came late in the development process, so there was little consideration in the design for efficient use of virtual storage.
My best chargeback example comes from the late great Security Pacific Bank, where we went to greaaaaaaat lengths to send out bills for system use. (I mentioned in an earlier post the elaborate scheme of account numbers, which were used as well in TSO by developers--hence the use of UADS for multiple account numbers per user.) The biggest problem with this chargeback mechanism was its enormous drain on resources. Collecting and processing barrelsful of SMF data turned out be one of the biggest applications in the shop--which was all overhead that had to be amortized across the business units. I can't believe that it was worth the trouble and cost. . . . J.O.Skip Robinson Southern California Edison Company Electric Dragon Team Paddler SHARE MVS Program Co-Manager 323-715-0595 Mobile 626-302-7535 Office [email protected] -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Martin Packer Sent: Wednesday, March 09, 2016 9:09 AM To: [email protected] Subject: (External):Re: Does everybody use chargeback? Interestingly, I know of at least 1 customer for whom sticking the whole of their main DB2 table in memory ISN'T an option - even with the biggest (10TB) z13. I'm jolly sure they're not alone. And I suspect this will persist for a VERY long time. Absolutely not against Data In Memory. Far from it, by the way. Cheers, Martin Martin Packer, zChampion, Principal Systems Investigator, Worldwide Cloud & Systems Performance, IBM +44-7802-245-584 email: [email protected] Twitter / Facebook IDs: MartinPacker Blog: https://www.ibm.com/developerworks/mydeveloperworks/blogs/MartinPacker From: Ed Jaffe <[email protected]> To: [email protected] Date: 09/03/2016 16:12 Subject: Re: Does everybody use chargeback? Sent by: IBM Mainframe Discussion List <[email protected]> On 3/8/2016 9:59 PM, Jesse 1 Robinson wrote: > -- A data base application was redesigned at the last minute to read > the entire data base into memory at startup. The business unit noticed that they were charged for I/O but not for memory use. It was cheaper to occupy virtual storage than to perform reads. So much for common sense. They were obviously ahead of their time! These days, memory-mapped files are highly encouraged as one way to utilize that "free" memory everyone is getting on their z13! -- Edward E Jaffe Phoenix Software International, Inc 831 Parkview Drive North El Segundo, CA 90245 http://www.phoenixsoftware.com/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
