| ID TYpe Database ID Replica ID Unique ID OID Note ID GNID IID giid | All DBs unique unique unique unique not unique unique not unique unique | Note Revisions n/a n/a same different same same different different | DB Replicas different same same same different different different different | Notes DB Copies different different same same same different different different | OS DB Copies same same same same (w/o revision) same same same (w/o revision) same (w/o revision) |