Oracle表空间查看sql使用情况

select a.tablespace_name tablespace_name
,nvl(ceil((1 - b.free / a.total)  100), 100) "usage_of_tablespace%"
,nvl(b.free, 0) "left_space(M)"
,c.extent_management "Extent_management"
from (select tablespace_name, sum(nvl(bytes, 0)) / 1024 / 1024 total
from dba_data_files
group by tablespace_name) a
,(select tablespace_name, sum(nvl(bytes, 0)) / 1024 / 1024 free
from dba_free_space
group by tablespace_name) b
,dba_tablespaces c
where a.tablespace_name = c.tablespace_name
and c.tablespace_name = b.tablespace_name(+);