Thanks but sorry EdStevens,
I was referring to DB Administration/auditing etc on HP Open VMS in specific. Tools or Grid agent installation steps for effective and easy monitoring.
And I was referring to "DB Administration/auditing etc " on any platform. Oracle's AUDIT function is the same regardless of OS.
"I found suddenly a couple of schema sizes showing very less in size than usaul,"
Exactly what do you mean by "schema sizes showing very less in size than usual"? Schemas don't have sizes. Only segments.
Perhaps if you were more explicit in exactly what problem you are trying to solve, we could give better advice, but whatever it is, I seriously doubt that the solution will be OS-specific.