SELECT UPPER(F.TABLESPACE_NAME) "表空间名",
  D.TOT_GROOTTE_MB "已建表空间大小(M)",
  D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
  TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB 100,2),'990.99') "使用比",
  F.TOTAL_BYTES "空闲空间(M)",
  F.MAX_BYTES "最大块(M)"
 FROM (SELECT TABLESPACE_NAME,
   ROUND(SUM(BYTES) / (1024
1024), 2) TOTAL_BYTES, --剩余
   ROUND(MAX(BYTES) / (1024 1024), 2) MAX_BYTES
   FROM SYS.DBA_FREE_SPACE
   GROUP BY TABLESPACE_NAME) F,
   (SELECT DD.TABLESPACE_NAME,
   ROUND(SUM(DD.BYTES) / (1024
1024), 2) TOT_GROOTTE_MB --已建表空间求和
   FROM SYS.DBA_DATA_FILES DD
   GROUP BY DD.TABLESPACE_NAME) D
 WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME
-- AND F.TABLESPACE_NAME='DATALIST' ----
 ORDER BY 4 DESC;