I don't think the number of address spaces in a subsystem matters too much. What's eating me, though, is the numbers of Db2 subsystems. Recent "social circle" includes 135, 80, and several at 50+.
I suppose, though, the multiplier - MSTR+IRLM+DIST+DBM1+optionals x #subsystems - is the killer. (Right now I'm working with a customer multi-tenant SAP/Db2 plus legacy which is kinda interesting as each SAP application has, as is well known, it's own Db2s (often several).) 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 Podcast Series (With Marna Walle): https://developer.ibm.com/tv/mpt/ or https://itunes.apple.com/gb/podcast/mainframe-performance-topics/id1127943573?mt=2 From: Wayne Bickerdike <[email protected]> To: [email protected] Date: 02/11/2017 09:30 Subject: Re: Db2! was: NODE.js for z/OS Sent by: IBM Mainframe Discussion List <[email protected]> IMS DB/DC was MVS. The DC part was never available on DOS/VS or VSE, the interface was CICS on the VSE platform. So DL/I was the data management layer and the APIs / Call interface were almost identical on both VSE and MVS. As a PL/1 jockey in the 1970's at IBM we coded mainly batch IMS (Call PLITODLI). A few years later I was coding IMS DB and BMPs. A few years later I was in a full on IMS DB/DC shop. IBM recycled the log manager of IMS into DB2 and MQ seems to have very similar topology. Why DB2 has so many address spaces is probably because of the IMS heritage. Other (simpler but equally effective DBMS) manage on a single address space....I wish... On Thu, Nov 2, 2017 at 6:20 PM, Timothy Sipples <[email protected]> wrote: > Walt Farrell wrote: > >The z is still lowercase in z/OS, though :) > > Also lowercase in z/VM, z/VSE, and z/TPF. For now, at least. The future is > not fully predictable. :-) > > ------------------------------------------------------------ > -------------------------------------------- > Timothy Sipples > IT Architect Executive, Industry Solutions, IBM Z and LinuxONE, AP/GCG/MEA > E-Mail: [email protected] > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > -- Wayne V. Bickerdike ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
