Tom Marchant wrote:
It depends upon how many TSO users you have. IIRC, there is a limit to the number of associations a user catalog can have.
There is indeed, and you can only have about 3,500 prior to z/OS V1.13. But in z/OS V1.13 and z/OS V2.1, with Type V extension records enabled (make sure you're past the backout window if coming from z/OS V1.12 before turning them on), you can have about 500,000. That's "about" because the lengths of the alias entries you create affects how many you can have.
This particular catalog enhancement seems to have escaped much notice, but some people I've mentioned it to have been very pleased to learn there was "no rush any more" to split some usercat or another for this reason alone. For one odd reason or another, many people appear to dislike splitting user catalogs (smile).
The number of catalog connector aliases you can have has nothing to do with how many TSO/E users are logged on concurrently as I think was suggested in another post; it's only relevant how many are defined.
Also, you can now have larger catalogs (up to a full volume in size for the foreseeable future, as the new architectural limit is 123TB) starting in z/OS V1.12, and access usercats and volcats in RLS mode starting in z/OS V2.1.
-- John Eells z/OS Technical Marketing IBM Poughkeepsie [email protected] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
