openGauss每日一练第5天 | 学习心得体会

openGauss每日一练第5天 | 学习心得体会

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

omm=# CREATE USER user3 PASSWORD 'abcd@123';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# CREATE USER user3 IDENTIFIED BY 'abcd@789';
ERROR:  role "user3" already exists
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 PASSWORD 'abcd@346';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE 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                                                                                                      
| {}
 user2     | Create DB                                                                                                        
| {}
 user3     |                                                                                                                  
| {}
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2.修改用户user1的密码

omm=# alter USER user1 IDENTIFIED BY 'user1@1234';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
ALTER ROLE
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3.重命名用户user2

omm=# alter user user2 rename to user20;
NOTICE:  MD5 password cleared because of role rename
ALTER ROLE
omm=# 
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 
| {}
 user3     |                                                                                                                  
| {}

 user1     | Create role                                                                                                      
| {}
 user20    | Create DB                                                                                                        
| {}
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4.将用户user1的权限授权给用户user3，再回收用户user3的权限

omm=# \du user3
           List of roles
 Role name | Attributes | Member of 
-----------+------------+-----------
 user3     |            | {}

omm=# grant user1 to user3;
GRANT ROLE
omm=# \du user3
           List of roles
 Role name | Attributes | Member of 
-----------+------------+-----------
 user3     |            | {user1}

omm=# revoke user1 from user3;
omm=# REVOKE ROLE
omm=# 
omm=# \du user3
           List of roles
 Role name | Attributes | Member of 
-----------+------------+-----------
 user3     |            | {}
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5.删除所有创建用户

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     |                                                                                                                  
| {}

omm=# drop user user1;
DROP ROLE
omm=# drop user user20;
DROP ROLE
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 
| {}
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