-- 查看表空间物理文件的名称及大小
SELECT tablespace_name, file_id, file_name, round(bytes / (1024 * 1024), 2) total_space
FROM dba_data_files ORDER BY tablespace_name;

-- 表空间占用情况
SELECT a.segment_name, b.table_name, sum(a.bytes)/ 1024 / 1024 AS mb
FROM dba_segments a LEFT JOIN dba_lobs b ON a.segment_name = b.segment_name
WHERE a.tablespace_name = 'DSPACE' GROUP BY a.segment_name, b.table_name ORDER BY mb DESC;

-- 查询所有用户所对应的表空间，有dba权限的帐号，如sys,system

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