之前寫程式需要實現乙個查詢資料庫表空間使用率的功能，雖然不知道做它的意義有多大，專案要求就得做。
寫了乙個，只能查到永久表空間，temp表空間不知道怎麼查詢，今天上網找了找，把sql補充完整了，其實都是找來現有的資源用的，收藏一下。
select *
from (select a.tablespace_name tablespacename,
nvl(a.bytes / 1024 / 1024,0) totalsize,
nvl(b.largest / 1024 / 1024,0) freesize,
nvl((a.bytes - b.bytes) / 1024 / 1024,0) usedsize,
round(nvl((a.bytes - b.bytes) / a.bytes * 100, 0), 2) usedpercent
from (select tablespace_name, sum(bytes) bytes
from dba_data_files
group by tablespace_name) a,
(select tablespace_name, sum(bytes) bytes, max(bytes) largest
from dba_free_space
group by tablespace_name) b
where a.tablespace_name = b.tablespace_name
order by a.tablespace_name)
union
select d.tablespace_name tablespacename,
nvl(a.bytes / 1024 / 1024, 0) totalsize,
nvl(a.bytes / 1024 / 1024, 0) - nvl(t.bytes, 0) / 1024 / 1024 freesize,
nvl(t.bytes, 0) / 1024 / 1024 usedsize,
round(nvl(t.bytes / a.bytes * 100, 0), 2) usedpercent
from sys.dba_tablespaces d,
(select tablespace_name, sum(bytes) bytes
from dba_temp_files
group by tablespace_name) a,
(select tablespace_name, sum(bytes_cached) bytes
from v$temp_extent_pool
group by tablespace_name) t
where d.tablespace_name = a.tablespace_name(+)
and d.tablespace_name = t.tablespace_name(+)
and d.extent_management like 'local'
and d.contents like 'temporary'
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