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 'adcd@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 password 'abcd@123';
NOTICE: The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# \du
List of roles
Role name | Attributes | Membe
r of
-----------+------------------------------------------------------------------------------------------------------------------+------
-----
gaussdb | Sysadmin | {}
omm | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT | {}
user1 | Create role | {}
user2 | Create DB | {}
user3 | | {}
omm=# #
2.修改用户user1的密码
omm=# alter user user1 identified by '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
omm=# \du
List of roles
Role name | Attributes | Membe
r of
-----------+------------------------------------------------------------------------------------------------------------------+------
-----
gaussdb | Sysadmin | {}
omm | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT | {}
user1 | Create role | {}
user20 | Create DB | {}
user3
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=# revoke user1 from user3;
REVOKE ROLE
omm=# \du
List of roles
Role name | Attributes | Membe
r of
-----------+------------------------------------------------------------------------------------------------------------------+------
-----
gaussdb | Sysadmin | {}
omm | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT | {}
user1 | Create role | {}
user20 | Create DB | {}
user3 | | {}
omm=#
5.删除所有创建用户
omm=# drop user user1;
DROP ROLE
omm=# drop user user20;
DROP ROLE
omm=# drop user user3;
DROP ROLE
过程中使用\du或\du+查看用户信息
omm=# \du
omm | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT | {}
List of roles
Role name | Attributes | Membe
r of
-----------+------------------------------------------------------------------------------------------------------------------+------
-----
gaussdb | Sysadmin
-----------------------END-----------------------
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