Hi Michael,
I have yet to see a site running IMS/DC and not run IMS/DB.
Have you actually seen this?
BTW, the article had more than one technical error. For example, a JCL
Step name with 9 characters.
Regards,
David
On 2023-07-25 13:16, Schmitt, Michael wrote:
The Ars Technica article was discussing CICS as an application server. I was
comparing CICS as an application server to IMS/TM as an application server. The
DBMS is a different issue; there's no reason why IMS/TM must be used with
IMS/DB. You can use IMS/TM with DB2.
The point I was trying to make was that CICS was designed as a cooperative
multitasking system that reproduces all of the OS functions in itself. IMS/TM
(originally IMS/DC) was designed to use the OS to do OS things and does none of
that in itself, so it is *much* simpler.
-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of
David Spiegel
Sent: Tuesday, July 25, 2023 11:48 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: [EXT] Ars Technica: The IBM mainframe: How it runs and why it
survives
Hi Michael,
You said: "...CICS is to IMS as Windows 3.1 is to Windows 10. ..."
You're comparing apples and oranges.
(CICS has no native Database portion.)
BTW, a lot of the banks, insurance companies etc. are running CICS+DB2.
The majority of IMS users need it to support 40+ year old application
systems.
Which one is the real dinosaur? (Hint: It's not CICS)
Regards,
David
On 2023-07-25 10:37, Schmitt, Michael wrote:
So CICS is no longer doing cooperative multitasking within each AOR, and thus
requiring CICS versions of OS commands to prevent wait states from freezing the
entire AOR? A CICS program can do direct GETMAINs, LOADS, abends, rather than
use CICS commands? CICS no longer requires special versions of tools (e.g.
debugger, abend dump management) and instead can use the same tools as batch
programs? A CICS programmer no longer needs to learn a long list of CICS
commands and EXEC CICS syntax? A CICS region no longer contains the storage
from all of the transactions currently running and is now only one transaction
in the region at a time? CICS transactions can no longer stomp on each other's
memory?
Great, I did not know that.
IMS/TM uses the operating system for multitasking. There are no IMS/TM specific
tools. An IMS/TM programmer only needs to know two commands, one to get a
message and another to send it. IMS transaction abends look (almost) exactly
like a batch abend. IMS programs have no restrictions on OS facilities. An IMS
program can even do an STIMER (WAIT) without affecting any other transaction
processing. Because, it uses the OS to do *preemptive* multitasking, like a
modern operating system.
-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of
Crawford Robert C (Contractor)
Sent: Tuesday, July 25, 2023 8:14 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: [EXT] Ars Technica: The IBM mainframe: How it runs and why it
survives
Sorry, I worked in a shop that had both and I can tell you CICS is way more
flexible, modern and performed better.
I will give you this: IMS is a great piece of 90's technology.
Robert Crawford
Abstract Evolutions LLC
(210) 913-3822
-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of
Schmitt, Michael
Sent: Monday, July 24, 2023 11:43 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: [EXT] Ars Technica: The IBM mainframe: How it runs and why it survives
Ars Technica published a deep-dive explainer of modern IBM mainframes:
https://arstechnica.com/information-technology/2023/07/the-ibm-mainframe-how-it-runs-and-why-it-survives/
Iād quibble with the application server topic that talks about CICS with no
mention of IMS/TM. CICS is to IMS as Windows 3.1 is to Windows 10. š
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