Compute
Elastic Cloud Server
Huawei Cloud Flexus
Bare Metal Server
Auto Scaling
Image Management Service
Dedicated Host
FunctionGraph
Cloud Phone Host
Huawei Cloud EulerOS
Networking
Virtual Private Cloud
Elastic IP
Elastic Load Balance
NAT Gateway
Direct Connect
Virtual Private Network
VPC Endpoint
Cloud Connect
Enterprise Router
Enterprise Switch
Global Accelerator
Management & Governance
Cloud Eye
Identity and Access Management
Cloud Trace Service
Resource Formation Service
Tag Management Service
Log Tank Service
Config
OneAccess
Resource Access Manager
Simple Message Notification
Application Performance Management
Application Operations Management
Organizations
Optimization Advisor
IAM Identity Center
Cloud Operations Center
Resource Governance Center
Migration
Server Migration Service
Object Storage Migration Service
Cloud Data Migration
Migration Center
Cloud Ecosystem
KooGallery
Partner Center
User Support
My Account
Billing Center
Cost Center
Resource Center
Enterprise Management
Service Tickets
HUAWEI CLOUD (International) FAQs
ICP Filing
Support Plans
My Credentials
Customer Operation Capabilities
Partner Support Plans
Professional Services
Analytics
MapReduce Service
Data Lake Insight
CloudTable Service
Cloud Search Service
Data Lake Visualization
Data Ingestion Service
GaussDB(DWS)
DataArts Studio
Data Lake Factory
DataArts Lake Formation
IoT
IoT Device Access
Others
Product Pricing Details
System Permissions
Console Quick Start
Common FAQs
Instructions for Associating with a HUAWEI CLOUD Partner
Message Center
Security & Compliance
Security Technologies and Applications
Web Application Firewall
Host Security Service
Cloud Firewall
SecMaster
Anti-DDoS Service
Data Encryption Workshop
Database Security Service
Cloud Bastion Host
Data Security Center
Cloud Certificate Manager
Edge Security
Managed Threat Detection
Blockchain
Blockchain Service
Web3 Node Engine Service
Media Services
Media Processing Center
Video On Demand
Live
SparkRTC
MetaStudio
Storage
Object Storage Service
Elastic Volume Service
Cloud Backup and Recovery
Storage Disaster Recovery Service
Scalable File Service Turbo
Scalable File Service
Volume Backup Service
Cloud Server Backup Service
Data Express Service
Dedicated Distributed Storage Service
Containers
Cloud Container Engine
SoftWare Repository for Container
Application Service Mesh
Ubiquitous Cloud Native Service
Cloud Container Instance
Databases
Relational Database Service
Document Database Service
Data Admin Service
Data Replication Service
GeminiDB
GaussDB
Distributed Database Middleware
Database and Application Migration UGO
TaurusDB
Middleware
Distributed Cache Service
API Gateway
Distributed Message Service for Kafka
Distributed Message Service for RabbitMQ
Distributed Message Service for RocketMQ
Cloud Service Engine
Multi-Site High Availability Service
EventGrid
Dedicated Cloud
Dedicated Computing Cluster
Business Applications
Workspace
ROMA Connect
Message & SMS
Domain Name Service
Edge Data Center Management
Meeting
AI
Face Recognition Service
Graph Engine Service
Content Moderation
Image Recognition
Optical Character Recognition
ModelArts
ImageSearch
Conversational Bot Service
Speech Interaction Service
Huawei HiLens
Video Intelligent Analysis Service
Developer Tools
SDK Developer Guide
API Request Signing Guide
Terraform
Koo Command Line Interface
Content Delivery & Edge Computing
Content Delivery Network
Intelligent EdgeFabric
CloudPond
Intelligent EdgeCloud
Solutions
SAP Cloud
High Performance Computing
Developer Services
ServiceStage
CodeArts
CodeArts PerfTest
CodeArts Req
CodeArts Pipeline
CodeArts Build
CodeArts Deploy
CodeArts Artifact
CodeArts TestPlan
CodeArts Check
CodeArts Repo
Cloud Application Engine
MacroVerse aPaaS
KooMessage
KooPhone
KooDrive

CREATE USER MAPPING

Updated on 2024-08-20 GMT+08:00

Description

CREATE USER MAPPING defines a new mapping from a user to an external server. A user mapping usually contains connection information. The foreign data wrapper uses the connection information and the information contained in the external server to access an external data source, the owner of an external server can create a user mapping for the server for any user. If a user is granted the USAGE privilege on the server, the user can create a user mapping for its own username.

Precautions

  • If the password option is displayed, ensure that the usermapping.key.cipher and usermapping.key.rand files exist in the $GAUSSHOME/bin directory of each node in GaussDB. If the two files do not exist, use the gs_guc tool to generate them and use the gs_ssh tool to release them to the $GAUSSHOME/bin directory on each node in GaussDB. For details, see the description in OPTIONS ( { option_name 'value' } [, ...] ).

  • When multi-layer quotation marks are used for sensitive columns (such as password) in OPTIONS, the semantics is different from that in the scenario where quotation marks are not used. Therefore, sensitive columns are not identified for anonymization.

Syntax

CREATE USER MAPPING FOR { user_name | USER | CURRENT_USER | PUBLIC }
    SERVER server_name
    [ OPTIONS ( option 'value' [ , ... ] ) ];

Parameters

  • user_name

    Specifies the name of an existing user to map to a foreign server.

    CURRENT_USER and USER match the name of the current user. When PUBLIC is specified, a public mapping is created and used when no mapping for a particular user is available.

  • server_name

    Specifies the name of the existing server for a created user mapping.

  • OPTIONS ( { option_name ' value ' } [, ...] )

    Specifies options for user mapping. These options typically define the actual username and password of this mapping. The option name must be unique. The allowed option names and values are related to the foreign data wrapper of the server.

    NOTE:
    • User passwords are encrypted and stored in the system catalog PG_USER_MAPPING. During the encryption, usermapping.key.cipher and usermapping.key.rand are used as the encryption password file and encryption factor. Before using the tool for the first time, create the two files, save the files to the $GAUSSHOME/bin directory on each node, and ensure that you have the read permission on the files. gs_ssh helps you quickly place files in the specified directory of each node.
      gs_ssh -c "gs_guc generate -o usermapping -S default -D $GAUSSHOME/bin"
    • If the -S parameter is set to default, a password is randomly generated. You can also specify a password for the -S parameter to ensure the security and uniqueness of the generated password file. You do not need to save or memorize the password. For details about other parameters, see the description of the gs_guc tool in the "Tool Reference".

Examples

-- Create a role.
gaussdb=# CREATE ROLE bob PASSWORD '********';

-- Create a foreign server.
gaussdb=# CREATE SERVER my_server FOREIGN DATA WRAPPER log_fdw;

-- Create a user mapping.
gaussdb=# CREATE USER MAPPING FOR bob SERVER my_server OPTIONS (USER 'bob', PASSWORD '********');

-- Modify the user mapping.
gaussdb=# ALTER USER MAPPING FOR bob SERVER my_server OPTIONS (SET PASSWORD '********');

-- Delete the user mapping.
gaussdb=# DROP USER MAPPING FOR bob SERVER my_server;

-- Delete the foreign server.
gaussdb=# DROP SERVER my_server;

-- Delete the role.
gaussdb=# DROP ROLE bob;

We use cookies to improve our site and your experience. By continuing to browse our site you accept our cookie policy. Find out more

Feedback

Feedback

Feedback

0/500

Selected Content

Submit selected content with the feedback