Thanks for the detailed reply Sambavan. After loggin in as Oracle User, I tried invoking emca like how you described, and I got back message saying it's not found. What do I lack here and what should I do? Do you think I might not have installed emca?? Where would this emca be.. I checked Ora_home/bin and few more directories ... Unless I invoke this I cannot create a repository and go forward...
What are my choices..
What does creating repository mean and how is it used?