DBA Role Privs

I want to be notified every time the DBA role is granted or revoked via
email.  I found the procedure which takes care of the email.  Next I
created a trigger on Insert into the Dba Role Privs view and received
the error that this can not be performed on a view.  Does anyone know
the underlying Sys table(s) to use, or a better way of checking this?


Thank you, 


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