尚硅谷Oracle教程-学习笔记2

时间:2022-09-22 06:55:00

控制用户权限

1.创建用户

1)

SQL> create user atguigu01
2 identified by atguigu01;
User created

2)

SQL> grant create session
2 to atguigu01;
Grant succeeded

3)

SQL> grant create table
2 to atguigu01;
Grant succeeded

4)

SQL> alter user atguigu01 quota 5m
2 on users;
User altered

2.创建角色

1)

SQL> create role my_role;
Role created

2)

SQL> grant create session,create table,create view to my_role;
Grant succeeded

3)

SQL> create user atguigu02
2 identified by atguigu02;
User created

4)

SQL> grant my_role to atguigu02;
Grant succeeded
SQL>

3.使用GRANT 和 REVOKE 语句赋予和回收权限

1)

SQL> grant select,update
2 on scott.employees
3 to atguigu01;
Grant succeeded

2)

SQL> grant select
2 on scott.departments
3 to atguigu01
4 with grant option;
Grant succeeded

3)

SQL> grant select,update
2 on locations
3 to public;
Grant succeeded

4)

SQL> revoke select
2 on employees
3 from atguigu01;
Revoke succeeded

尚硅谷Oracle教程-学习笔记2

作业:

  • 1.如果用户能够登陆到数据库,至少需要哪种权限?是系统权限还是对象权限

    CREATE SESSION 系统权限
  • 2.创建表需要哪种权限?

    CREATE TABLE
  • 3.将表departments的查询权限分配给用户system
Grant select
on departments
to system;
  • 4.从system处收回刚才赋予的权限
REVOKE select
on departments
from system;
  • 5.创建角色dvp,并将如下权限赋予该角色

     CREATE PROCEDURE

     CREATE SESSION

     CREATE TABLE

     CREATE SEQUENCE

     CREATE VIEW

    1)
CREATE ROLE dvp;

2)

GRANT CREATE PROCEDURE,CREATE SESSION,CREATE TABLE,CREATE SEQUENCE,CREATE VIEW
TO dvp;