venkat kulkarni wrote:
Yes, z/OS V1.13 is planned to be the last release to support
*BPX.DEFAULT.USER*.  IBM recommends that we either use the BPX.UNIQUE.USER
support that was introduced in z/OS V1.11,
  or assign unique UIDs to users who need them and assign GIDs for their
groups.
<snip>

Of course, if you are already using BPX.NEXT.USER, you can either continue using that, or choose to convert to BPX.UNIQUE.USER. If you have implemented neither one, UNIQUE is the way to go.

One additional note is that NEXT requires the RACF DB to be at AIM stage 2, while UNIQUE requires AIM stage 3. (Both have been around a Long Time.) There's a not-so-new health check for AIM stage 3, that was added for z/OS R12 with UA64936 and for z/OS R13 with UA64937 in April 2012, and a related check to see whether UIDs will be automatically assigned.

--
John Eells
z/OS Technical Marketing
IBM Poughkeepsie
ee...@us.ibm.com

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