Correction(*):
We hit this years ago. 
I even made calculations to monitor if we were approaching the limit and had to 
add another usercatalog.
The limit is the size of aliases for a usercatalog in the Mastercatalog record. 
The sum of all values: 'alias length + 3 bytes' (*) is limited to about 32300 
bytes. So this is about 3230 (*) TSO users.

Kees.

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf 
Of Staller, Allan
Sent: Tuesday, June 24, 2014 15:30
To: [email protected]
Subject: Re: Catalog considerations for a new(ish) systems programmer 
(UNCLASSIFIED)

I have never hit this restriction in 40 years. IIRC it is a large number.
I was thinking more about the SIZE of the catalog, not the number of aliases 
associated with the catalog.

<snip>
On Mon, 23 Jun 2014 19:51:26 +0000, Staller, Allan wrote:

>I am not sure I can see the need (technically) for more than one TSO 
>ucat, presuming there is anything resembling a rational retention 
>policy.

It depends upon how many TSO users you have. IIRC, there is a limit to the 
number of associations a user catalog can have.
</snip>

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