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Unregister Database from RMAN Catalog

Unregistering the database from catalog:
rman target sys/password@targetdb catalog rman/rman@catalogdb
RMAN> unregister database noprompt;

Unregistering the database that is not unique in catalog:
rman catalog rman/rman@catalogdb
RMAN> run
  set dbid 3213213213;   # DBID of target DB
  unregister database targetdb noprompt;

Note: NOPROMPT - specifies that RMAN not ask you for confirmation before unregistering the database.