DROP TABLESPACE RBGRMS INCLUDING CONTENTS AND DATAFILES;
DROP TABLESPACE RBGRWMS INCLUDING CONTENTS AND DATAFILES;
DROP TABLESPACE PA INCLUDING CONTENTS AND DATAFILES;
DROP TABLESPACE pos INCLUDING CONTENTS AND DATAFILES;

DROP TABLESPACE accbiz INCLUDING CONTENTS AND DATAFILES;

删除用户
drop user accbiz;
drop user bustest cascade;

drop user ； 仅仅是删除用户，
drop user ×× cascade ；会删除此用户名下的所有表和视图。

Oracle中强行断开用户连接的方法:

首先查找目标用户的当前进程,注意是serial#而不是serial,网上有的介绍漏掉了#:
select sid,serial# from v$session where username='accbiz';
使用此语句会返回一个进程列表,每行有两个数字,然后用数字替代下面的sid和serial
alter system kill session 'sid,serial';
例如
alter system kill session '222,123';
通过select 语句可能返回多行记录,所以要多次执行alter语句

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select t2.username,t2.sid,t2.serial#,t2.logon_time
from v$locked_object t1,v$session t2
where t1.session_id=t2.sid order by t2.logon_time;

alter system kill session '149,1410'