1）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*1024), 2)||' GB' total_space 
FROM dba_data_files 
ORDER BY tablespace_name;
2）查看表空间的使用情况 
SELECT round(SUM(bytes)/(1024*1024*1024),2)||' GB' AS free_space, tablespace_name 
FROM dba_free_space 
GROUP BY tablespace_name; 
3）查看表空间的使用情况 
SELECT a.tablespace_name, 
round(a.bytes/(1024*1024*1024),2)||' GB' total, 
round(b.bytes/(1024*1024*1024),2)||' GB' used, 
round(c.bytes/(1024*1024*1024),2)||' GB' free, 
round((b.bytes * 100) / a.bytes)||'%' "% USED ", 
round((c.bytes * 100) / a.bytes)||'%' "% FREE " 
FROM sys.sm$ts_avail a, sys.sm$ts_used b, sys.sm$ts_free c 
WHERE a.tablespace_name = b.tablespace_name 
AND a.tablespace_name = c.tablespace_name;