1 修改用户密码
a) sqlplus
SQL> PASSWORD [username]
( oldpassword: ・・・)
newpassword: ・・・
b) SQL文
ALTER USER username IDENTIFIED BY "new_password" ;
2 用户的锁定和解锁
ALTER USER username ACCOUNT LOCK PASSWORD EXPIRE ；
ALTER USER username ACCOUNT UNLOCK ;
3 修改用户的表空间和临时空间
ALTER USER username DEFAULT TABLESPACE tablespace_name ;
ALER USER username TEMPORARY TABLESPACE {temp_name|temp_group_name} ;
4 修改用户磁盘配额
ALTER USER username QUOTA integer{K|M} ON tablespace_name;
ALTER USER username QUOTA UNLIMITED ON tablespace_name ;
5 修改用户的日志文件
ALTER USER username PROFILE profile_name ;
