I think you mean that IBM recycled the lock manager of IMS into Db2. Also I think the driver for the multiple address spaces was that DB2 originally was written to run on MVS/370 so it had to pack a lot into the 8-10 Meg virtual that many installations had available. And even once XA was available, until the XTIOT came out, most of the I/O and allocation related control blocks were in 24 bit storage.
Wayne Driscoll Rocket Software Note - All opinions are strictly my own. -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Wayne Bickerdike Sent: Thursday, November 2, 2017 4:30 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Db2! was: NODE.js for z/OS 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 <sipp...@sg.ibm.com> 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: sipp...@sg.ibm.com > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- Wayne V. Bickerdike ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ================================ Rocket Software, Inc. and subsidiaries ■ 77 Fourth Avenue, Waltham MA 02451 ■ Main Office Toll Free Number: +1 877.328.2932 Contact Customer Support: https://my.rocketsoftware.com/RocketCommunity/RCEmailSupport Unsubscribe from Marketing Messages/Manage Your Subscription Preferences - http://www.rocketsoftware.com/manage-your-email-preferences Privacy Policy - http://www.rocketsoftware.com/company/legal/privacy-policy ================================ This communication and any attachments may contain confidential information of Rocket Software, Inc. All unauthorized use, disclosure or distribution is prohibited. If you are not the intended recipient, please notify Rocket Software immediately and destroy all copies of this communication. Thank you. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
