第五课用户管理学习作业打卡

学习目标：学习openGauss创建用户、修改用户属性、更改用户权限和删除用户

用户是用来登录数据库的，通过对用户赋予不同的权限，可以方便地管理用户对数据库的访问及操作

1.创建用户

user1、user2和user3，user1具有CREATEROLE权限，user2具有CREATEDB权限，要求使用两种不同的方法设置密码

CREATE USER user1 CREATEROLE PASSWORD ‘abcd@123’;
CREATE USER user2 CREATEDB IDENTIFIED BY ‘abcd@456’;
CREATE USER user3 PASSWORD ‘abcd@789’;

omm=# CREATE USER user1 CREATEROLE PASSWORD 'abcd@123';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# CREATE USER user2 CREATEDB IDENTIFIED BY 'abcd@456';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# CREATE USER user3 PASSWORD 'abcd@789';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE

2.修改用户user1的密码

ALTER USER user1 IDENTIFIED BY ‘Abcd@123’;

omm=# ALTER USER user1 IDENTIFIED BY 'Abcd@123';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
ALTER ROLE
omm=# 

3.重命名用户user2

alter user user2 rename to user20;

omm=# alter user user2 rename to user20;
NOTICE:  MD5 password cleared because of role rename
ALTER ROLE

4.用户授权

将用户user1的权限授权给用户user3，再回收用户user3的权限
GRANT user1 to user3;
revoke user1 from user3;

GRANT ROLE
omm=# \du
                                                              List of roles
 Role name |                                                    Attributes                                                    
| Member of 
-----------+------------------------------------------------------------------------------------------------------------------
+-----------
 gaussdb   | Sysadmin                                                                                                         
| {}
 omm       | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT 
| {}
 user1     | Create role                                                                                                      
| {}
 user20    | Create DB                                                                                                        
| {}
 user3     |                                                                                                                  
| {user1}

omm=# revoke user1 from user3;
REVOKE ROLE

5.删除所有创建用户

drop user user1;
drop user user20;
drop user user3;

                                                              List of roles
 Role name |                                                    Attributes                                                    
| Member of 
-----------+------------------------------------------------------------------------------------------------------------------
+-----------
 gaussdb   | Sysadmin                                                                                                         
| {}
 omm       | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT 
| {}
 user1     | Create role                                                                                                      
| {}
 user20    | Create DB                                                                                                        
| {}
 user3     |                                                                                                                  
| {}

omm=#  
omm=# drop user user1;
omm=# DROP ROLE

omm=# \du
                                                              List of roles
 Role name |                                                    Attributes                                                    
| Member of 
-----------+------------------------------------------------------------------------------------------------------------------
+-----------
 gaussdb   | Sysadmin                                                                                                         
| {}
 omm       | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT 
| {}
 user20    | Create DB                                                                                                        
| {}
 user3     |                                                                                                                  
| {}

omm=# drop user user20;
DROP ROLE
omm=# \du
-----------+------------------------------------------------------------------------------------------------------------------
+-----------
 gaussdb   | Sysadmin                                                                                                         
| {}
 omm       | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT 
| {}
 user3     |                                                                                                                  
| {}

                                                              List of roles
 Role name |                                                    Attributes                                                    
| Member of 
omm=# drop user user3;
DROP ROLE
omm=# \du
                                                              List of roles
 Role name |                                                    Attributes                                                    
| Member of 
-----------+------------------------------------------------------------------------------------------------------------------
+-----------
 gaussdb   | Sysadmin                                                                                                         
| {}
 omm       | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT 
| {}