Oracle数据库容量使用情况调查

-- 剩余容量
select sum(bytes) FREE from DBA_FREE_SPACE where tablespace_name ='xxx';
-- 总容量
select sum(bytes) TOTAL from DBA_DATA_FILES where tablespace_name ='xxx';

查询整个数据库剩余和使用的表空间大小使用情况：

select df.tablespace_name "表空间名",totalspace "总空间M",freespace "剩余空间M",round((1-freespace/totalspace)*100,2) "使用率%" 
from 
(select tablespace_name,round(sum(bytes)/1024/1024) totalspace 
from dba_data_files 
group by tablespace_name) df, 
(select tablespace_name,round(sum(bytes)/1024/1024) freespace 
from dba_free_space 
group by tablespace_name) fs 
where df.tablespace_name=fs.tablespace_name;