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The error is very much clear, as you are duplicating the database ,then the db_name must be same.
RMAN-05520: database name mismatch, auxiliary instance has SID1, command specified SID2
I don't able to understand, are you duplicating the existing database (or) trying to create new database using dbca on the same host ?
I used *bold* dbca to create the new oracle instance SID2*bold* and checked the entried in the lisntner.ora and tnsnames.ora and they seems to be fine. The primary db is in mount mode and the aux database is in nomount mode. I am trying to run this command from the the db session where ORACLE_SID=SID.
Sine the dbca is not at all required. I suggest kindly check the process/steps from oracle recovery manager doc.
- Pavan Kumar N