Oracle查询表空间的使用情况和数据文件是否拓展及剩余可拓展大小

SELECT R1.*,R2.MAX_SIZE_GB FROM
(SELECT  /*+ ORDERED */
A.TABLESPACE_NAME TABLESPACE_NAME,ROUND(A.BYTES / 1024 / 1024 / 1024,2) CURRENT_SIZE_GB,ROUND((A.BYTES - B.BYTES) / 1024 / 1024 / 1024,2) USED_SIZE_GB,ROUND(B.BYTES / 1024 / 1024 / 1024,2) FREE_SIZE_GB,ROUND(((A.BYTES - B.BYTES) / A.BYTES) * 100,2) PERCENT_USED_RATE
  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.TABLESPACE_NAME) R1,(SELECT /*+ ORDERED */
 D.TABLESPACE_NAME TABLESPACE_NAME,ROUND(SUM(D.BYTES) / 1024 / 1024 / 1024,ROUND(SUM(D.MAXBYTES) / 1024 / 1024 / 1024,2) MAX_SIZE_GB
  FROM SYS.DBA_DATA_FILES D,V$DATAFILE V,(SELECT VALUE FROM V$PARAMETER WHERE NAME = 'db_block_size') E
 WHERE (D.FILE_NAME = V.NAME)
 GROUP BY D.TABLESPACE_NAME) R2
 WHERE R1.TABLESPACE_NAME = R2.TABLESPACE_NAME;

执行效果如下：

这条语句应该还有优化的空间，懂得sql优化的DBA可以试试，然后回复下我，谢谢！