Mark,

        You are right to be concerned.  It is purely a trust that the users
(DBAs or anyone else) will always have the proper environmental params
included as part of the RMAN process.  If they don't you're dead, unless you
back up the recovery catalog very, very well before any actions are taken
prior to delete activities.

        Gary L. Ison
        Governor's Office for Technology
        101 Cold Harbor Drive
        Frankfort, Ky.   40601
        Phone:  (502) 564-8724
            Fax:  (502) 564-6856
E-mail: Gary.Ison AT mail.state.ky DOT us <mailto:Gary.Ison AT mail.state.ky 
DOT us>