Remove an Instance that has not been mounted.

Hello

I recently created an oracle instance, 11.2.0.4,  by starting the instance in nomount mode using a pfile. I then created a spfile and shut the instance down. At no point has the instance been mounted as no controlfiles will exist.

I was going to do an rman duplication of a database from another host but realised the OS weren't compatable.

I now want to create a database, using the same SID that I used for the unmounted instance, using dbca and simply datapump import the relevenat schemas.

When I tried to create a database in DBCA it indicated that the SID already existed.