sqlplus /nolog conn /as sysdba # 修改system密码为123123 alter user system identified by 123123; # 修改sys密码为123123 alter user sys identified by 123123; # 修改密码规则策略为密码永不过期 ALTER PROFILE DEFAULT LIMIT PASSWORD_LIFE_TIME UNLIMITED; # 修改数据库最大连接数据; alter system set processes=1000 scope=spfile; alter user scott account unlock; alter user scott identified by abc; commit;