ORACLE之表空间

SELECT DF.TABLESPACE_NAME "表空间名",
       TOTALSPACE "总空间G",
       FREESPACE "剩余空间G",
       ROUND((1 - FREESPACE / TOTALSPACE) * 100, 2) "使用率%"
  FROM (SELECT TABLESPACE_NAME,
               ROUND(SUM(BYTES) / 1024 / 1024 / 1024, 2) TOTALSPACE
          FROM DBA_DATA_FILES
         GROUP BY TABLESPACE_NAME) DF,
       (SELECT TABLESPACE_NAME,
               ROUND(SUM(BYTES) / 1024 / 1024 / 1024, 2) FREESPACE
          FROM DBA_FREE_SPACE
         GROUP BY TABLESPACE_NAME) FS
WHERE DF.TABLESPACE_NAME = FS.TABLESPACE_NAME;