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select substr(a.tablespace_name,1,30) tablespace ,
round(sum(a.total1)/1024/1024,1) "전체" ,
round(sum(a.total1)/1024/1024,1)-round(sum(a.sum1)/1024/1024,1) "사용량MB" ,
round(sum(a.sum1)/1024/1024,1) "여유"
from
(select tablespace_name,0 total1,sum(bytes) sum1,max(bytes) MAXB,count(bytes) cnt
from dba_free_space
group by tablespace_name
union
select tablespace_name,sum(bytes) total1,0,0,0
from dba_data_files
group by tablespace_name) a
group by a.tablespace_name
order by tablespace;
출처 : http://kwon8999.tistory.com/3