相关操作代码如下：
connect / as sysdba;
shutdown abort;
startup;
drop user user1 cascade;
exit
oracle命令行创建用户：
相关操作代码如下：
create user user1
identified by values 'fa091872a2cc669c'
default tablespace user1
temporary tablespace temp
profile default
account unlock;
-- 4 roles for user1
grant recovery_catalog_owner to user1 with admin option;
grant resource to user1 with admin option;
grant dba to user1 with admin option;
grant connect to user1 with admin option;
alter user user1 default role all;
-- 3 system privileges for user1
grant select any dictionary to user1 with admin option;
grant unlimited tablespace to user1 with admin option;
grant alter any procedure to user1 with admin option;