CREATE USER

Description

Creates a user with a specified password. A user is a basic element for GaussDB authentication. You can use the correct username and password to log in to the GaussDB and grant different permissions to different users so that different users can perform different operations.

Precautions

A user created using the CREATE USER statement has the LOGIN permission by default.
When you run the CREATE USER command to create a user, the system creates a schema with the same name as the user in the database where the command is executed.
The owner of an object created by a system administrator in a schema with the same name as a common user is the common user, not the system administrator.

Syntax

CREATE USER user_name [ [ WITH ] option [ ... ] ] [ ENCRYPTED | UNENCRYPTED ] { PASSWORD | IDENTIFIED BY } { 'password' [EXPIRED] | DISABLE };

The option clause is used to configure information, including permissions and properties.

{SYSADMIN | NOSYSADMIN}
    | {MONADMIN | NOMONADMIN}
    | {OPRADMIN | NOOPRADMIN}
    | {POLADMIN | NOPOLADMIN}
    | {AUDITADMIN | NOAUDITADMIN}
    | {CREATEDB | NOCREATEDB}
    | {USEFT | NOUSEFT}
    | {CREATEROLE | NOCREATEROLE}
    | {INHERIT | NOINHERIT}
    | {LOGIN | NOLOGIN}
    | {REPLICATION | NOREPLICATION}
    | {PERSISTENCE | NOPERSISTENCE}
    | CONNECTION LIMIT connlimit
    | VALID BEGIN 'timestamp'
    | VALID UNTIL 'timestamp'
    | RESOURCE POOL 'respool'
    | USER GROUP 'groupuser'
    | PERM SPACE 'spacelimit'
    | TEMP SPACE 'tmpspacelimit'
    | SPILL SPACE 'spillspacelimit'
    | NODE GROUP logic_cluster_name
    | IN ROLE role_name [, ...]
    | IN GROUP role_name [, ...]
    | ROLE role_name [, ...]
    | ADMIN role_name [, ...]
    | USER role_name [, ...]
    | SYSID uid
    | DEFAULT TABLESPACE tablespace_name
    | PROFILE DEFAULT
    | PROFILE profile_name
    | PGUSER

Parameters

user_name
Name of the user to be created.

Value range: a string. It must comply with the naming convention. A value can contain a maximum of 63 characters.

If a username contains uppercase letters, the database automatically converts the uppercase letters into lowercase letters. To create a username that contains uppercase letters, enclose the username with double quotation marks ("").
password
Specifies the login password.

The new password must:
- Contain at least eight characters. This is the default length.
- Differ from the username or the username spelled backward.
- Contain at least three of the following character types: uppercase characters, lowercase characters, digits, and special characters (limited to ~!@#$%^&*()-_=+\|[{}];:,<.>/?).
- The password can also be a ciphertext character string that meets the format requirements. This mode is mainly used to import user data. You are advised not to use it directly. If a ciphertext password is used, the user must know the plaintext corresponding to the ciphertext password and ensure that the password meets the complexity requirements. The database does not verify the complexity of the ciphertext password. Instead, the security of the ciphertext password is ensured by the user.
- Be enclosed by single quotation marks when a user is created.
Value range: a string

For other parameters, see CREATE ROLE.

Examples

-- Create user jim whose login password is ********.
gaussdb=# CREATE USER jim PASSWORD '********';

-- Create user kim whose login password is ********.
gaussdb=# CREATE USER kim IDENTIFIED BY '********';

-- Create user tom whose login password is ********.
gaussdb=# CREATE USER TOM PASSWORD '**********';

-- Create user TOM whose login password is ********.
gaussdb=# CREATE USER "TOM" PASSWORD '**********';

-- To create a user with the CREATEDB permission, add the CREATEDB keyword.
gaussdb=# CREATE USER dim CREATEDB PASSWORD '********';

-- Query the permissions of the dim user.
gaussdb=#  \du dim
           List of roles
 Role name | Attributes | Member of 
-----------+------------+-----------
 dim       | Create DB  | {}
(You can see that the dim user has the CREATEDB permission.)

-- Change the login password of user jim.
gaussdb=# ALTER USER jim IDENTIFIED BY '**********' REPLACE '********';

-- Add the CREATEROLE permission to jim.
gaussdb=# ALTER USER jim CREATEROLE;

-- View the CREATEROLE permission added to user jim.
gaussdb=# \du jim
            List of roles
 Role name | Attributes  | Member of 
-----------+-------------+-----------
 jim       | Create role | {}

-- Set enable_seqscan to on. (The setting will take effect in the next session.)
gaussdb=# ALTER USER jim SET enable_seqscan TO on;

-- Reset the enable_seqscan parameter for jim.
gaussdb=# ALTER USER jim RESET enable_seqscan;

-- Lock jim.
gaussdb=# ALTER USER jim ACCOUNT LOCK;

-- Unlock jim.
gaussdb=# ALTER USER jim ACCOUNT UNLOCK;

-- Change the user password.
gaussdb=# ALTER USER dim WITH PASSWORD '********';

-- Change the username.
gaussdb=# ALTER USER dim RENAME TO lisa;

-- Delete the user.
gaussdb=# DROP USER kim CASCADE;
gaussdb=# DROP USER jim CASCADE;
gaussdb=# DROP USER lisa CASCADE;
gaussdb=# DROP USER TOM CASCADE;
gaussdb=# DROP USER "TOM" CASCADE;