oracle中空间查询的示例分析

这篇文章主要介绍oracle中空间查询的示例分析，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

~~~~~~~~~~~~~ORACLE查看某用户占用了多少空间~~~~~~~~~~~~~~~~

SELECT OWNER, TABLESPACE_NAME, ROUND(SUM(BYTES) / 1024 / 1024, 2) "USED(M)"
FROM DBA_SEGMENTS
GROUP BY OWNER, TABLESPACE_NAME
ORDER BY SUM(BYTES) DESC;

~~~~~~~~~~~~~~~~~~~~查询某个用户下表所占用的空间~~~~~~~~~~~~~~~~~~~
Select OWNER, t.segment_name, t.segment_type, sum(t.bytes / 1024 / 1024) mmm
from dba_segments t
where t.owner = 'xxx'
and t.segment_type='TABLE'
group by OWNER, t.segment_name, t.segment_type
order by mmm desc;

~~~~~~~~~~~~~~~~~数据文件的高水位线~~~~~~~~~~~~~~~~~···

select a.file#,
a.name,
a.bytes / 1024 / 1024 CurrentMB,
ceil(HWM * a.block_size) / 1024 / 1024 ResizeTo,
(a.bytes - HWM * a.block_size) / 1024 / 1024 ReleaseMB,
'alter database datafile ''' || a.name || ''' resize ' ||
ceil(HWM * a.block_size / 1024 / 1024) || 'M;' ResizeCMD
from v$datafile a,
(select file_id, max(block_id + blocks - 1) HWM
from dba_extents
group by file_id) b
where a.file# = b.file_id(+)
and (a.bytes - HWM * block_size) > 0
order by 5

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