select tch , file#, dbablk ,
       case when obj = 4294967295
       then 'rbs/compat segment'
       else (select max('('||object_type||')'||owner||'.'||object_name)||
             decode(count(*),1,'','maybe!')
             from dba_objects
             where data_object_id = X.OBJ)
        end what
        from (
        select tch , file# ,dbablk,obj from x$bh where state <>0
        order by tch desc) x
        where rownum <=5
        /