I suspect that it's tied in to two other 8 character limits:
1. components of a dsname
2. job names, whether batch, STC of TSO
But why couldn't they have put the length before the 8 character userid and a
reserved area after, so that it would be easier to expand the limit in the
future? :-(
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
________________________________________
From: IBM Mainframe Discussion List [[email protected]] on behalf of
Paul Gilmartin [[email protected]]
Sent: Thursday, April 30, 2020 9:57 PM
To: [email protected]
Subject: Re: Mainframe user ID length
On Thu, 30 Apr 2020 19:46:04 +0000, Frank Swarbrick wrote:
>Is z/OS still limited in all cases to 8 upper case characters? I am curious
>if a user that only has access to MQ might be able to have a longer and
>ideally mixed case user ID. They wouldn't have access to TSO or CICS or IMS.
>
Extending TSO UserIDs from 7 to 8 was egregious underreaching.
Still a limit of 8, but for lower case see USERIDALIASTABLE in:
https://www.ibm.com/support/knowledgecenter/SSLTBW_2.2.0/com.ibm.zos.v2r2.bpxb200/urprr.htm
Why, why:
o Did rhey do this outside RACF? Conway's Law?
o Did they not go to far more than 8 when many other systems
allow a few dozen?
-- gil
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
