select upper(f.tablespace_name) "表空间名",
d.tot_grootte_mb "表空间大小(m)",
d.tot_grootte_mb - f.total_bytes "已使用空间(m)",
to_char(round((d.tot_grootte_mb - f.total_bytes) / d.tot_grootte_mb * 100,
2),
'990.99') "使用比",
f.total_bytes "空闲空间(m)",
f.max_bytes "最大块(m)"
from (select tablespace_name,
round(sum(bytes) / (1024 * 1024), 2) total_bytes,
round(max(bytes) / (1024 * 1024), 2) max_bytes
from sys.dba_free_space
group by tablespace_name) f,
(select dd.tablespace_name,
round(sum(dd.bytes) / (1024 * 1024), 2) tot_grootte_mb
from sys.dba_data_files dd
group by dd.tablespace_name) d
where d.tablespace_name = f.tablespace_name
order by 4 desc;

查看表空间中每个表的大小

select segment_name, isize || 'M'
from (select segment_name, sum(bytes) / 1024 / 1024 isize
from dba_segments
where tablespace_name = 'SNBST_HIST'
AND segment_type = 'TABLE'
GROUP BY segment_name)
order by isize desc;

查看表空间文件使用大小

SELECT B.TABLESPACE_NAME 表空间,
B.FILE_NAME 物理文件名,
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;