If don't of any command that would give you the databases in the catalog. but if I want want to see if database ABB is in the catalog
-connect to the catalog from database/sid ABB.
-give a command
- list backups or crosscheck backups or list incarnation etc etc.
-Now if the database is not registered RMAN would return error - database not registered in catalog...
Looking for the greatest evil in the world? Look in the mirror.
Yes, once we connect to RMAN catalog there are lot many way to investigate. But, I am trying to find is there any view available on the target database. I have tried in many places including metalink but could not find any thing and finally landed at my favourate forum.
Try hard to get what you like OR you will be forced to like what you get.