First, the good news.  A catalog can have up to 123 (if I recall correctly) 
extents.  If you haven't reached this limit, you should be OK.

If you are at (or near) this limit, it gets a bit fuzzy.  If, by creating a new 
entry in the catalog, you cause a CI split, which in turn causes a CA split, 
you 
may need to take another extent.  It only takes one entry to cause the CA 
split; thus, the inability to create this entry makes it look like the catalog 
is 
full.  On the other hand, there may be room for many thousands of catalog 
entries which fit into existing CIs and/or CAs.  It depends on the name of the 
entry to be cataloged (and, usually, the high-level qualifier).

Also, if I recall correctly, a catalog is limited to 4GB in size (the same as 
for 
any other non-extended format KSDS; catalogs do not have an extended 
format counterpart).  

You should allocate catalogs with secondary extents.  And, if you reach some 
threshold (determined by your installation ... say 100 extents), you should 
schedule a re-org.  A catalog re-org really doesn't require a stand-alone 
environment.  You just don't want things initiating while the export and import 
are running.  Export the catalog, close and unallocate the catalog, delete and 
re-define the catalog (larger?), and import (into empty) the catalog; it's 
rather 
quick.

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