1.        select a.tablespace_name "tbsname", 100-round((nvl(b.bytes_free,0)/a.bytes_alloc)*100,2) "ratio",
          round(a.bytes_alloc/1024/1024,2) "size(M)", round(nvl(b.bytes_free,0)/1024/1024,2) "free(M)",
          round((a.bytes_alloc-nvl(b.bytes_free,0))/1024/1024,2) "usedM)", to_char(sysdate,‘yyyy-mm-dd hh24:mi:ss‘) "get_time"
    from (
          select f.tablespace_name, sum(f.bytes) bytes_alloc, sum(decode(f.autoextensible,‘YES‘,f.maxbytes,‘NO‘,f.bytes)) maxbytes
            from dba_data_files f
           group by tablespace_name) a,
         (select f.tablespace_name, sum(f.bytes) bytes_free
            from dba_free_space f
           group by tablespace_name) b
   where a.tablespace_name = b.tablespace_name
   order by 2;

2.

        SELECT D.TABLESPACE_NAME,SPACE "SUM_SPACE(M)",BLOCKS
SUM_BLOCKS,SPACE-NVL(FREE_SPACE,0) "USED_SPACE(M)",
ROUND((1-NVL(FREE_SPACE,0)/SPACE)*100,2) "USED_RATE(%)",FREE_SPACE
"FREE_SPACE(M)"
FROM
(SELECT TABLESPACE_NAME,ROUND(SUM(BYTES)/(1024*1024),2)
SPACE,SUM(BLOCKS) BLOCKS
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) D,
(SELECT TABLESPACE_NAME,ROUND(SUM(BYTES)/(1024*1024),2) FREE_SPACE
FROM DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) F
WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME(+)
UNION ALL --if have tempfile
SELECT D.TABLESPACE_NAME,SPACE "SUM_SPACE(M)",BLOCKS SUM_BLOCKS,
USED_SPACE "USED_SPACE(M)",ROUND(NVL(USED_SPACE,0)/SPACE*100,2)
"USED_RATE(%)",
NVL(FREE_SPACE,0) "FREE_SPACE(M)"
FROM
(SELECT TABLESPACE_NAME,ROUND(SUM(BYTES)/(1024*1024),2)
SPACE,SUM(BLOCKS) BLOCKS
FROM DBA_TEMP_FILES
GROUP BY TABLESPACE_NAME) D,
(SELECT TABLESPACE_NAME,ROUND(SUM(BYTES_USED)/(1024*1024),2)
USED_SPACE,
ROUND(SUM(BYTES_FREE)/(1024*1024),2) FREE_SPACE
FROM V$TEMP_SPACE_HEADER
GROUP BY TABLESPACE_NAME) F
WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME(+)

本文出自 “elanjie” 博客，请务必保留此出处http://elanjie.blog.51cto.com/11847332/1912360

oracle中表空间的使用情况脚本