--查詢表空間大小
SELECT total.tablespace_name,
       Round(total.MB, 2)           AS Total_MB,
       Round(total.MB - free.MB, 2) AS Used_MB,
       Round(( 1 - free.MB / total.MB ) * 100, 2)
       || '%'                       AS Used_Pct
FROM   (SELECT tablespace_name,
               Sum(bytes) / 1024 / 1024 AS MB
        FROM   dba_free_space
        GROUP  BY tablespace_name) free,
       (SELECT tablespace_name,
               Sum(bytes) / 1024 / 1024 AS MB
        FROM   dba_data_files
        GROUP  BY tablespace_name) total
WHERE  free.tablespace_name = total.tablespace_name;

--表空間的datafile要根據資料庫安裝過程實際的路徑
--建立表空
--查表空間目錄 ：

select * from dba_data_files

--
--擴容根據實際大小來處理
--size指要擴充的大小
ALTER TABLESPACE 表空間名稱 ADD DATAFILE '檔案路徑\表空間名稱+日期.DBF' SIZE 2048M;