CREATE ROLE¶
Function¶
Create a role.
A role is an entity that has own database objects and permissions. In different environments, a role can be considered a user, a group, or both.
Important Notes¶
CREATE ROLE adds a role to a database. The role does not have the login permission.
Only the user who has the CREATE ROLE permission or a system administrator is allowed to create roles.
Syntax¶
CREATE ROLE role_name [ [ WITH ] option [ ... ] ] [ ENCRYPTED | UNENCRYPTED ] { PASSWORD | IDENTIFIED BY } { 'password' | DISABLE };
The syntax of role information configuration clause option is as follows:
{SYSADMIN | NOSYSADMIN}
| {AUDITADMIN | NOAUDITADMIN}
| {CREATEDB | NOCREATEDB}
| {USEFT | NOUSEFT}
| {CREATEROLE | NOCREATEROLE}
| {INHERIT | NOINHERIT}
| {LOGIN | NOLOGIN}
| {REPLICATION | NOREPLICATION}
| {INDEPENDENT | NOINDEPENDENT}
| {VCADMIN | NOVCADMIN}
| 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 rol e_name [, ...]
| USER role_name [, ...]
| SYSID uid
| DEFAULT TABLESPACE tablespace_name
| PROFILE DEFAULT
| PROFILE profile_name
| PGUSER
| AUTHINFO 'authinfo'
| PASSWORD EXPIRATOIN period
Parameter Description¶
role_name
Role name
Value range: a string. It must comply with the naming convention. and can contain a maximum of 63 characters.
password
Specifies the login password.
A password must:
Contain at least eight characters. This is the default length.
Differ from the user name or the user name spelled backwards.
Contains at least three of the following four character types: uppercase letters, lowercase letters, digits, and special characters, including:
~!@#$%^&*()-_=+\|[{}];:,<.>/?.If you use characters other than the four types, a warning is displayed, but you can still create the password.
Value range: a string
DISABLE
By default, you can change your password unless it is disabled. Use this parameter to disable the password of a user. After the password of a user is disabled, the password will be deleted from the system. The user can connect to the database only through external authentication, for example, IAM authentication, Kerberos authentication, or LDAP authentication. Only administrators can enable or disable a password. Common users cannot disable the password of an initial user. To enable a password, run ALTER USER and specify the password.
ENCRYPTED | UNENCRYPTED
Determines the password stored in the system is encrypted or unencrypted. (If neither is specified, the password status is determined by password_encryption_type.) According to product security requirements, the password must be stored encrypted. Therefore, UNENCRYPTED is forbidden in GaussDB(DWS). If the presented password string is already in SHA256-encrypted format, then it is stored encrypted as-is, regardless of whether ENCRYPTED or UNENCRYPTED is specified (since the system cannot decrypt the specified encrypted password string). This allows reloading of encrypted passwords during dump/restore.
SYSADMIN | NOSYSADMIN
Determines whether a new role is a system administrator. Roles having the SYSADMIN attribute have the highest permission.
Value range: If not specified, NOSYSADMIN is the default.
AUDITADMIN | NOAUDITADMIN
Determines whether a role has the audit and management attributes.
If not specified, NOAUDITADMIN is the default.
CREATEDB | NOCREATEDB
Defines a role's ability to create databases.
A new role does not have the permission to create databases.
Value range: If not specified, NOCREATEDB is the default.
USEFT | NOUSEFT
Determines whether a new role can perform operations on foreign tables, such as creating, deleting, modifying, and reading/witting foreign tables.
A new role does not have permissions for these operations.
The default value is NOUSEFT.
CREATEROLE | NOCREATEROLE
Determines whether a role will be permitted to create new roles (that is, execute CREATE ROLE and CREATE USER). A role with the CREATEROLE permission can also modify and delete other roles.
Value range: If not specified, NOCREATEROLE is the default.
INHERIT | NOINHERIT
Determines whether a role "inherits" the permissions of roles it is a member of. You are not advised to execute them.
LOGIN | NOLOGIN
Determines whether a role is allowed to log in to a database. A role having the LOGIN attribute can be thought of as a user.
Value range: If not specified, NOLOGIN is the default.
REPLICATION | NOREPLICATION
Determines whether a role is allowed to initiate streaming replication or put the system in and out of backup mode. A role having the REPLICATION attribute is a highly privileged role, and should only be used on roles used for replication.
If not specified, NOREPLICATION is the default.
INDEPENDENT | NOINDEPENDENT
Defines private, independent roles. For a role with the INDEPENDENT attribute, administrators' rights to control and access this role are separated. Specific rules are as follows:
Administrators have no rights to add, delete, query, modify, copy, or authorize the corresponding table objects without the authorization from the INDEPENDENT role.
Administrators have no rights to modify the inheritance relationship of the INDEPENDENT role without the authorization from this role.
Administrators have no rights to modify the owner of the table objects for the INDEPENDENT role.
Administrators have no rights to delete the INDEPENDENT attribute of the INDEPENDENT role.
Administrators have no rights to change the database password of the INDEPENDENT role. The INDEPENDENT role must manage its own password, which cannot be reset if lost.
The SYSADMIN attribute of a user cannot be changed to the INDEPENDENT attribute.
VCADMIN | NOVCADMIN
Defines the role of a logical cluster administrator. A logical cluster administrator has the following more permissions than common users:
Create, modify, and delete resource pools in the associated logical cluster.
Grant the access permission for the associated logical cluster to other users or roles, or reclaim the access permission from those users or roles.
CONNECTION LIMIT
Indicates how many concurrent connections the role can make.
Value range: Integer, >=-1. The default value is -1, which means unlimited.
Important
To ensure the proper running of a cluster, the minimum value of CONNECTION LIMIT is the number of CNs in the cluster, because when a cluster runs ANALYZE on a CN, other CNs will connect to the running CN for metadata synchronization. For example, if there are three CNs in the cluster, set CONNECTION LIMIT to 3 or a greater value.
VALID BEGIN
Sets a date and time when the role's password becomes valid. If this clause is omitted, the password will be valid for all time.
VALID UNTIL
Sets a date and time after which the role's password is no longer valid. If this clause is omitted, the password will be valid for all time.
RESOURCE POOL
Sets the name of resource pool used by the role, and the name belongs to the system catalog: pg_resource_pool.
USER GROUP 'groupuser'
Creates a sub-user. For details, see "Resource Load Management > Tenant Management > User Level Management" in the Developer Guide.
PERM SPACE
Sets the storage space of the user permanent table.
TEMP SPACE
Sets the storage space of the user temporary table.
SPILL SPACE
Sets the operator disk flushing space of the user.
NODE GROUP
Specifies the name of the logical cluster associated with a user. If the name contains uppercase characters or special characters, enclose the name with double quotation marks.
IN ROLE
Lists one or more existing roles whose permissions will be inherited by a new role. You are not advised to execute them.
IN GROUP
Indicates an obsolete spelling of IN ROLE. You are not advised to execute them.
ROLE
Lists one or more existing roles which are automatically added as members of the new role.
ADMIN
Is similar to ROLE. However, the roles after ADMIN can grant rights of new roles to other roles.
USER
Indicates an obsolete spelling of the ROLE clause.
SYSID
The SYSID clause is ignored.
DEFAULT TABLESPACE
The DEFAULT TABLESPACE clause is ignored.
PROFILE
The PROFILE clause is ignored.
PGUSER
This attribute is used to be compatible with open-source Postgres communication. An open-source Postgres client interface (Postgres 9.2.19 is recommended) can use a database user having this attribute to connect to the database.
Important
This attribute only ensures compatibility with the connection process. Incompatibility caused by kernel differences between this product and Postgres cannot be solved using this attribute.
Users having the PGUSER attribute are authenticated in a way different from other users. Error information reported by the open-source client may cause the attribute to be enumerated. Therefore, you are advised to use a client of this product. Example:
# normaluser is a user that does not have the PGUSER attribute. psql is the Postgres client tool. pg@MPPDB04:~> psql -d postgres -p 8000 -h 10.11.12.13 -U normaluser psql: authentication method 10 not supported # pguser is a user having the PGUSER attribute. pg@MPPDB04:~> psql -d postgres -p 8000 -h 10.11.12.13 -U pguser Password for user pguser:
AUTHINFO 'authinfo'
This attribute is used to specify the role authentication type. authinfo is the description character string, which is case sensitive. Only the LDAP type is supported. Its description character string is ldap. LDAP authentication is an external authentication mode. Therefore, PASSWORD DISABLE must be specified.
Important
Additional information about LDAP authentication can be added to authinfo, for example, fulluser in LDAP authentication, which is equivalent to ldapprefix+username+ldapsuffix. If the content of authinfo is ldap, the role authentication type is LDAP. In this case, the ldapprefix and ldapsuffix information is provided by the corresponding record in the pg_hba.conf file.
When executing the ALTER ROLE command, users are not allowed to change the authentication type. Only LDAP users are allowed to modify LDAP attributes.
PASSWORD EXPIRATOIN period
Number of days before the login password of the role expires. The user needs to change the password in time before the login password expires. If the login password expires, the user cannot log in to the system. In this case, the user needs to ask the administrator to set a new login password.
Value range: an integer greater than or equal to -1. The default value is -1, indicating that the password does not expire. The value 0 indicates that the password expires immediately.
Examples¶
Create a role manager.
CREATE ROLE manager IDENTIFIED BY '{password}';
Create a role with a validity from January 1, 2015 to January 1, 2026.
CREATE ROLE miriam WITH LOGIN PASSWORD '{password}' VALID BEGIN '2015-01-01' VALID UNTIL '2026-01-01';
Create a role. The authentication type is LDAP. Other LDAP authentication information is provided by pg_hba.conf.
CREATE ROLE role1 WITH LOGIN AUTHINFO 'ldap' PASSWORD DISABLE;
Create a role. The authentication type is LDAP. The fulluser information for LDAP authentication is specified during the role creation. In this case, LDAP is case sensitive and must be enclosed in single quotation marks.
CREATE ROLE role2 WITH LOGIN AUTHINFO 'ldapcn=role2,cn=user,dc=lework,dc=com' PASSWORD DISABLE;
Create a role and set the validity period of the login password to 30 days.
CREATE ROLE role3 WITH LOGIN PASSWORD '{password}' PASSWORD EXPIRATION 30;