select
b.file_name "物理文件名",
b.tablespace_name "表空间",
b.bytes/1024/1024 "大小M",
(b.bytes-sum(nvl(a.bytes,0)))/1024/1024 "已使用M",
substr((b.bytes-sum(nvl(a.bytes,0)))/(b.bytes)*100,1,5) "利用率"
from dba_free_space a,dba_data_files b
where a.file_id=b.file_id
group by b.tablespace_name,b.file_name,b.bytes
order by b.tablespace_name[@more@]