create tablespace news_tablespace datafile 
    'F:\oracle\product\10.1.0\oradata\news\news_data.dbf' size 500M;

    alter database datafile 'route of dbf' autoextend on next 100m;

 create user user_name identified by password tablespace tablespace_name;

 grant connect,resource to user_name; 

    drop user user_name cascade;

    DROP TABLESPACE tablespace_name INCLUDING CONTENTS AND DATAFILES;

以下语句可直接复制进入 pl/sql Developer 运行。

    select tablespace_name, file_id, file_name,
    round(bytes/(1024*1024),0) total_space
    from dba_data_files
    order by tablespace_name;

    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) "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;