oralce,查看各个表空间使用情况sql

SELECT A.TABLESPACE_NAME,
       A.BYTES / 1024 / 1024 "Sum MB",
       (A.BYTES - B.BYTES) / 1024 / 1024 "used MB",
       B.BYTES / 1024 / 1024 "free MB",
       ROUND(((A.BYTES - B.BYTES) / A.BYTES) * 100, 2) "percent_used"
  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;