openGauss每日一练第5天|学习openGauss创建用户、修改用户属性、更改用户权限和删除用户

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

课程学习

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

连接openGauss

#第一次进入等待15秒
#数据库启动中...
su - omm
gsql -r

1.创建用户

–以下两种设置密码方法等效

CREATE USER jim PASSWORD 'abcd@123';
CREATE USER kim IDENTIFIED BY 'abcd@456';

–用户dim具有创建数据库权限

CREATE USER dim CREATEDB PASSWORD 'abcd@789';

–查看用户

\du

2.修改用户属性

–修改密码

ALTER USER jim IDENTIFIED BY 'Abcd@123' REPLACE 'abcd@123';

–为用户jim增加CREATEROLE权限

ALTER USER jim CREATEROLE;

–查看用户

\du

3.授权

–将用户jim的权限授权给用户kim

GRANT jim to kim;

–将sysadmin权限授权给用户dim

GRANT ALL PRIVILEGES TO dim;

–重命名用户dim

alter user dim rename to tim;

–查看用户

\du

4.回收权限

–撤消kim的权限

REVOKE jim FROM kim;

–撤消用户dim的sysadmin权限

revoke all privilege from tim;

–查看用户

\du

5.删除用户

drop user tim;
drop user jim;
drop user kim;

课程作业

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 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@123';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# CREATE USER user3 IDENTIFIED BY 'abcd@123';
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     |           

2.修改用户user1的密码

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

3.重命名用户user2

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

4.将用户user1的权限授权给用户user3，再回收用户user3的权限

omm=# GRANT user1 to 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 all privilege from user3;
ALTER ROLE

5.删除所有创建用户 过程中使用\du或\du+查看用户信息

omm=# drop user user1;
DROP ROLE
omm=# drop user user2;
ERROR:  role "user2" does not exist
omm=# drop user user20;
DROP ROLE
omm=# drop user user3;
DROP ROLE