以system用户登录,查找需要删除的用户:
select * from dba_users;
select * from dba_data_files;
drop user 用户名称 cascade;
drop tablespace 表空间名称 including contents and datafiles cascade constraint;
例如:删除用户名成为LYK,表空间名称为LYK
drop user LYK cascade;
drop tablespace LYK including contents and datafiles cascade constraint;