oracle中查看表空间使用情况sql

SELECT F.TABLESPACE_NAME,
       (T.TOTAL_SPACE - F.FREE_SPACE)   "USED (MB)",
       F.FREE_SPACE   "FREE (MB)",
       T.TOTAL_SPACE   "TOTAL (MB)",
       (ROUND((F.FREE_SPACE / T.TOTAL_SPACE) * 100)) ||  '% '   PER_FREE
  FROM (SELECT TABLESPACE_NAME,
               ROUND(SUM(BLOCKS *
                         (SELECT VALUE / 1024
                            FROM V$PARAMETER
                           WHERE NAME = 'db_block_size') / 1024))   FREE_SPACE
          FROM DBA_FREE_SPACE
         GROUP BY TABLESPACE_NAME) F,
       (SELECT TABLESPACE_NAME, ROUND(SUM(BYTES / 1024/1024))   TOTAL_SPACE
          FROM DBA_DATA_FILES
         GROUP BY TABLESPACE_NAME) T
WHERE F.TABLESPACE_NAME = T.TABLESPACE_NAME;