>>You'll find it in the "Managing Catalogs" manual.  For z/OS 1.6, SC26-7409
>>(I have the -03 level).
>>
>>Here's an excerpt from that manual...
[chop]

I see how that excerpt could be misinterpreted.  An RCF is in order.
(Don't look at me, I don't do much with mainframes these days.)

> > 3000 seems small (to me). Is this *REALLY* saying 3000 per usercat?

> > A 3000 gross number seems just to way low, IMO.
> 
> The limit is per system.
> More exactly: aliases are defined in MCAT, which is one per system.

That explanation does't help at all.

My recollection of the way it works is that each UCAT entry also 
contains a list of all the ALIAS records which exist and point to
this UCAT.  In fact, I think that any entry which has aliases 
pointing to it contains a list of those aliases, so that when the
entry is removed all the aliases can be deleted without reading
every record in the catalog (MCAT in the UCAT case).

I've run shops with way way more than 3000 TSO users all with a
unique catalog alias.  I did discover the alias limit the hard way
once -- DEFINE ALIAS failed with some message equating to "catalog
record full."

> It 
> is possible to define aliases in UCAT, but these aliases are unusable.

That depends on what you're talking about.  You can have a non-vsam
entry in a ucat and have an alias in that ucat for that non-vsam
entry.


/Leonard

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