Oracle 数据库用户，表空间的创建删除 创建数据库表空间 create tablespace news_tablespace datafile 'F:\oracle\product\10.1.0\oradata\news\news_data.dbf' size 500M; 设置表空间自动增长 alter database datafile 'route of dbf' autoextend on next 100m; 创建用户 create user user_name identified by password tablespace tablespace_name; 用户授权 grant connect,resource to user_name; 删除用户 drop user user_name cascade; 删除表空间，删除表空间前先删除用户 DROP TABLESPACE tablespace_name INCLUDING CONTENTS AND DATAFILES; 查询表空间的名字及其所在位置　　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; 查询表空间使用情况 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;