ALTER-USER

ALTER-USER

Name

ALTER USER

Description

The ALTER USER command is used to modify a user's account attributes, including roles, passwords, and password policies.

ALTER USER [IF EXISTS] user_identity [IDENTIFIED BY 'password']
[DEFAULT ROLE 'role_name']
[password_policy]

user_identity:
    'user_name'@'host'

password_policy:

    1. PASSWORD_HISTORY [n|DEFAULT]
    2. PASSWORD_EXPIRE [DEFAULT|NEVER|INTERVAL n DAY/HOUR/SECOND]
    3. FAILED_LOGIN_ATTEMPTS n
    4. PASSWORD_LOCK_TIME [n DAY/HOUR/SECOND|UNBOUNDED]
    5. ACCOUNT_UNLOCK

About user_identity and password_policy, please refer to CREATE USER.

ACCOUNT_UNLOCK is used to unlock a locked user account.

You can only modify one of the following account attributes by one ALTER USER command at a time:

1. Change password
2. Change the role
3. Modify PASSWORD_HISTORY
4. Modify PASSWORD_EXPIRE
5. Modify FAILED_LOGIN_ATTEMPTS and PASSWORD_LOCK_TIME
6. Unlock a user account

Example

1. Change the user's password

   ALTER USER jack@‘%’ IDENTIFIED BY "12345";

2. Change the role of the user

   ALTER USER jack@'192.168.%' DEFAULT ROLE "role2";

3. Modify the user's password policy

   ALTER USER jack@'%' FAILED_LOGIN_ATTEMPTS 3 PASSWORD_LOCK_TIME 1 DAY;

4. Unlock a user account

   ALTER USER jack@'%' ACCOUNT_UNLOCK

Keywords

ALTER, USER

Best Practice

1. Change the role

   If a user was assigned Role A and you need to change that, firstly, the system will revoke all privileges corresponding to Role A from the user, and replace them with the privileges corresponding to the new role.

   Note that if the user has been individually granted a certain privilege before, which is included in Role A, that privilege will also be revoked in the role change.

   For example:

   Supposing that Role A has the following privilege: select_priv on db1.*, you assign Role A to User 1.

   Then you separately grant the following privilege to User 1: GRANT select_priv, load_priv on db1.* to user1

   Supposing that Role B has the following privilege: alter_priv on db1.tbl1, you change the role of User 1 to Role B.

   Then at the end, User 1 will have the following privileges: alter_priv on db1.tbl1 and load_priv on db1.*

2. Modify the password policy

   1. By modifying PASSWORD_EXPIRE , you can reset the timing of password expiration.

   2. By modifying FAILED_LOGIN_ATTEMPTS or PASSWORD_LOCK_TIME , you can unlock the user.