学习目标

用户和角色管理。

课程作业

1、创建test10_tbs的表空间，在这个表空间中创建数据库testdb10

omm=# CREATE TABLESPACE test10_tbs RELATIVE LOCATION 'tablespace/test_tbs1';
CREATE TABLESPACE
omm=# CREATE DATABASE testdb10 WITH TABLESPACE = test10_tbs;
CREATE DATABASE

2、使用create user创建用户user10，登录数据库testdb10，创建测试表t1和t2

omm=# 
CREATE USER user10 IDENTIFIED BY '1111@aaaa';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=#  GRANT ALL ON DATABASE testdb10 TO user10;
GRANT
omm=# \l
                         List of databases
   Name    | Owner | Encoding | Collate | Ctype | Access privileges 
-----------+-------+----------+---------+-------+-------------------
 omm       | omm   | UTF8     | C       | C     | 
 postgres  | omm   | UTF8     | C       | C     | 
 template0 | omm   | UTF8     | C       | C     | =c/omm           +
           |       |          |         |       | omm=CTc/omm
 template1 | omm   | UTF8     | C       | C     | =c/omm           +
           |       |          |         |       | omm=CTc/omm
 testdb10  | omm   | UTF8     | C       | C     | =Tc/omm          +
           |       |          |         |       | omm=CTc/omm      +
           |       |          |         |       | user10=CTc/omm   +
           |       |          |         |       | user10=APm/omm
omm=# \du(5 rows)


                                                              List of roles
 Role name |                                                    Attributes                                                    | 
Member of 
-----------+-----------------------------------------------------------------------+-
----------
 gaussdb   | Sysadmin     | 
{}
 omm       | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT | 
{}
 user10    |                                                                                                                  | 
{}

omm-# \c testdb10 user10
Password for user user10: 
testdb10-> Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "testdb10" as user "user10".

3、使用create role创建角色role10，登录数据库testdb10

CREATE ROLE role10 IDENTIFIED BY 'kunpeng@1234';
  GRANT ALL ON DATABASE testdb TO role10;

--查看当前openGauss数据库集群由哪些用户：
  \du
   \q
                                    

 gsql -d testdb  -U role10  -W kunpeng@1234 -r

gsql: FATAL:  role "role10" is not permitted to login

4、将表t1直接删除，将前面创建的表空间和数据库、表t2转给role10，删除用户user10

drop table t1;
REASSIGN OWNED BY user10 to role10;
drop user user10;

5、最后删除role10

drop role role10;