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
On this page

Resetting Parameters

Updated on 2023-10-23 GMT+08:00

You are advised to modify some parameters on the GaussDB console. If the parameters cannot be modified on the console, evaluate the risks and contact customer service.

Background

GaussDB provides multiple methods to set the GUC parameters of databases, users, or sessions.

  • Parameter names are case-insensitive.
  • A parameter value can be an integer, floating point value, string, Boolean value, or enumerated value.
    • The Boolean values can be on/off, true/false, yes/no, or 1/0, and are case-insensitive.
    • The enumerated value range is specified in the enumvals column of the pg_settings system catalog.
  • For parameters using units, specify their units during the setting. Otherwise, default units are used.
    • The default units are specified in the unit column of pg_settings.
    • The unit of memory can be KB, MB, or GB.
    • The unit of time can be ms, s, min, h, or d.

For details about parameters in the hosts configuration template, see GaussDB.

Setting GUC Parameters

GaussDB provides six types of GUC parameters. For details about parameter types and their setting methods, see Table 1.

Table 1 GUC parameters

Category

Description

How to Set

INTERNAL

Fixed parameter. It is set during database creation and cannot be modified. Users can only view the parameter by running the SHOW command or in the pg_settings view.

None

POSTMASTER

Database server parameter. It can be set when the database is started or in the configuration file.

Method 1 in Table 2.

SIGHUP

Global database parameter. It can be set when the database is started or be modified later.

Method 1, 2, in Table 2.

BACKEND

Session connection parameter. It is specified during session connection creation and cannot be modified after that. The parameter setting becomes invalid when the session is disconnected. This is an internal parameter and not recommended for users to set it.

Method 1, 2, in Table 2.

NOTE:

The parameter setting takes effect when the next session is created.

SUSET

Database administrator parameter. It can be set by common users when or after the database is started. It can also be set by database administrators using SQL statements.

Method 1 or 2 by a common user, or method 3 by a database administrator in Table 2.

USERSET

Common user parameter. It can be set by any user at any time.

Method 1, 2, or 3 in Table 2.

You can set GUC parameters in GaussDB using the three methods listed in Table 2.
Table 2 Methods for setting GUC parameters

No.

How to Set

Method 1

  1. Log in to the management console.
  2. On the Instances page, click the instance name to go to the Basic Information page.
  3. In the navigation pane on the left, click Parameters. On the displayed page, modify parameters.

    If the parameters cannot be modified on the console, evaluate the risks in advance and contact customer service for modification.

  4. Restart the database to make the setting take effect.
    NOTE:

    Rebooting instances will interrupt user operations. Plan a proper execution window before the restart.

Method 2

  1. Log in to the management console.
  2. On the Instances page, click the instance name to go to the Basic Information page.
  3. In the navigation pane on the left, click Parameters. On the displayed page, modify parameters.

    If the parameters cannot be modified on the console, evaluate the risks in advance and contact customer service for modification.

Method 3:

Set parameters at specific database, user, and session levels.

  • Set a database-level parameter.
    1
    openGauss=# ALTER DATABASE dbname SET paraname TO value;
    

    The setting takes effect in the next session.

  • Set a user-level parameter.
    1
    openGauss=# ALTER USER username SET paraname TO value;
    

    The setting takes effect in the next session.

  • Set a session-level parameter.
    1
    openGauss=# SET paraname TO value;
    

    Parameter value in the current session is changed. After you exit the session, the setting becomes invalid.

    NOTE:

    Session-level parameters set by SET have the highest priority, followed by parameters set by ALTER. Parameter values set by ALTER DATABASE have a higher priority than those set using ALTER USER. Priorities of the first three methods are all higher than those of gs_guc.

CAUTION:

If you use method 1 or 2 to set a parameter that does not belong to the current environment, the database displays a message indicating that the parameter is not supported.

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