thanks BV

I have only 1 database, HEAT and that database is up and running. so iam confused when it says that "Database is not avalable". I want to back up the HEAT database itself using Control file.(The information can be stored in the control file or in a recovery catalog). I have not created any Recovery catalog .

Like i said...
1. Installed 10g R2
2. Created a Test Database HEAT ( with Archive log & flash Recovery area using DBCA)
3. started EMCTL
4. connected to Database thru database control using sys id
5. now..when i try to use RMAN , i get this error ..

What database is it saying that is not availabel ?...HEAT is available...

Iam confused.