查询表空间使用情况语句

SELECT A.TABLESPACE_NAME "表空间",
      A.BYTES / 1024 / 1024 "总大小(MB)",
      (A.BYTES - B.BYTES) / 1024 / 1024 "已使用(MB)",
      B.BYTES / 1024 / 1024 "剩余大小(MB)",
      ROUND(((A.BYTES - B.BYTES) / A.BYTES) * 100, 2) "使用百分比(%)"
  FROM (SELECT TABLESPACE_NAME, SUM(BYTES)BYTES
         FROM DBA_DATA_FILES
        GROUP BY TABLESPACE_NAME) A,
      (SELECT TABLESPACE_NAME, SUM(BYTES) BYTES, MAX(BYTES) LARGEST
         FROM DBA_FREE_SPACE
        GROUP BY TABLESPACE_NAME) B
 WHERE A.TABLESPACE_NAME = B.TABLESPACE_NAME
 ORDER BY ((A.BYTES - B.BYTES) / A.BYTES)DESC;