ORACLE查看表空间使用率

之前写程序需要实现一个查询数据库表空间使用率的功能，虽然不知道做它的意义有多大，项目要求就得做。

写了一个，只能查到永久表空间，TEMP表空间不知道怎么查询，今天上网找了找，把SQL补充完整了，其实都是找来现有的资源用的，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'