select tablespace_name,sum(decode(status,'EXPIRED',bytes,0)) "EXPIRED", round(sum(decode(status,'EXPIRED',bytes,0))/sum(bytes),4)*100 "Reused Ratio",
       sum(decode(status,'UNEXPIRED',bytes,0)) "UNEXPIRED", sum(decode(status,'ACTIVE',bytes,0)) "ACTIVE",
       round((sum(decode(status,'UNEXPIRED',bytes,0))+sum(decode(status,'ACTIVE',bytes,0)))/sum(bytes),4)*100 "Used Ratio"
from dba_undo_extents group by tablespace_name
order by 1;


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