IRLM, History, what it stands for

Avram Friedman

IRLM, History, what it stands for
IRLM Stands for
I bet this turns into one of thoes discusions like does the DFH prefix
for CICS modules stand for
Destined For Hersley
or
Dollars For Software

There is a source for IRLM standing for IMS Resource Lock Manager in
IDUGs own history (1999) see web page
http://www.idug.org/idug/member/journal/mar00/tidbit.cfm

IBM in a 1995 article disagrees, says IRLM stands for
Internal Resource Lock Manager (IRLM).
This is from IBM's first IMS newsletter and can be found at
http://www-306.ibm.com/software/data/ims/quarterly/issue1/ims1.html

I personally have been an IMS Systems Programmer since before IMS/VS
(Supported IMS 360 at a number of sites) To the best of my memory IRLM
originaly
stood for Inter Region Lock Manager. It was introduced with IMS/VS V2
in 1981 and its primary reason for existance was it was the Inter Region
Lock Manager
... Diffrent from PI (Program Isolation) because it lived in a diffrent
address space (region) than the classic IMS control function. IMS
moved its database
ownership its own address space as well, called the DLISAS (Seperate
Address Space) as well to address VSCR considerations ... may give you
an idea of where DBM1 concept came from.

In over 35 years of providing IMS support for lots of customers and
software vendors and hardware vendors I never heard that the I in IRLM
stood for IMS, from an IMS person. Its something a DB2 person made up,
I think, and it stuck.

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William Favero

Re: IRLM, History, what it stands for
(in response to Avram Friedman)
It stand for Internal Resource Lock Manager. This is from the
current DB2 Admin Guide.

It started out as the IMS Resouce Lock Manager as many have pointed
out. However, with DB2's increased use of it, back in DB2 Version 4 it
was renamed ( I believe)...

Willie

Avram Friedman wrote:

>IRLM Stands for
>I bet this turns into one of thoes discusions like does the DFH prefix
>for CICS modules stand for
>Destined For Hersley
>or
>Dollars For Software
>
>There is a source for IRLM standing for IMS Resource Lock Manager in
>IDUGs own history (1999) see web page
>http://www.idug.org/idug/member/journal/mar00/tidbit.cfm
>
>IBM in a 1995 article disagrees, says IRLM stands for
>Internal Resource Lock Manager (IRLM).
>This is from IBM's first IMS newsletter and can be found at
>http://www-306.ibm.com/software/data/ims/quarterly/issue1/ims1.html
>
>I personally have been an IMS Systems Programmer since before IMS/VS
>(Supported IMS 360 at a number of sites) To the best of my memory IRLM
>originaly
>stood for Inter Region Lock Manager. It was introduced with IMS/VS V2
>in 1981 and its primary reason for existance was it was the Inter Region
>Lock Manager
>... Diffrent from PI (Program Isolation) because it lived in a diffrent
>address space (region) than the classic IMS control function. IMS
>moved its database
>ownership its own address space as well, called the DLISAS (Seperate
>Address Space) as well to address VSCR considerations ... may give you
>an idea of where DBM1 concept came from.
>
>In over 35 years of providing IMS support for lots of customers and
>software vendors and hardware vendors I never heard that the I in IRLM
>stood for IMS, from an IMS person. Its something a DB2 person made up,
>I think, and it stuck.
>
>---------------------------------------------------------------------------------
>Welcome to the IDUG DB2-L list. To unsubscribe, go to the archives and home page at http://www.idugdb2-l.org/archives/db2-l.html. From that page select "Join or Leave the list". If you will be out of the office, send the SET DB2-L NO MAIL command to [login to unmask email] The IDUG List Admins can be reached at [login to unmask email] Find out the latest on IDUG conferences at http://conferences.idug.org/index.cfm
>
>
>

--

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