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

Miscellaneous Parameters

Updated on 2024-10-14 GMT+08:00

server_version

Parameter description: Specifies the server version number.

This parameter is a fixed INTERNAL parameter and cannot be modified. This parameter is inherited from the PostgreSQL kernel, indicating that the current database kernel is compatible with PostgreSQL's server_version. This parameter is reserved to ensure the ecosystem compatibility of the northbound external tool APIs (which will be queried when the tool is connected). This parameter is not recommended. You can use the opengauss_version() function to obtain the kernel version.

Value range: a string

Default value: 9.2.4

server_version_num

Parameter description: Specifies the server version number.

This parameter is a fixed INTERNAL parameter and cannot be modified. This parameter is inherited from the PostgreSQL kernel, indicating that the current database kernel is compatible with PostgreSQL's server_version_num. This parameter is reserved to ensure the ecosystem compatibility of the northbound external tool APIs (which will be queried when the tool is connected).

Value range: an integer

Default value: 90204

block_size

Parameter description: Specifies the block size of the current database.

This parameter is a fixed INTERNAL parameter and cannot be modified. This parameter is inherited from the PostgreSQL kernel, indicating that the current database kernel is compatible with PostgreSQL's server_version_num. This parameter is reserved to ensure the ecosystem compatibility of the northbound external tool APIs.

Default value: 8192

segment_size

Parameter description: Specifies the segment file size of the current database.

This parameter is a fixed INTERNAL parameter and cannot be modified.

Default value: 1 GB

max_index_keys

Parameter description: Specifies the maximum number of index keys supported by the current database.

This parameter is a fixed INTERNAL parameter and cannot be modified.

Default value: 32

integer_datetimes

Parameter description: Specifies whether the date and time are in the 64-bit integer format.

This parameter is a fixed INTERNAL parameter and cannot be modified.

Value range: Boolean

  • on indicates that the 64-bit integer format is used.
  • off indicates that the 64-bit integer format is not used.

Default value: on

enable_cluster_resize

Parameter description: If an SQL statement involves tables belonging to different groups, you can enable this parameter to push the execution plan of the statement to improve performance.

This parameter is a SUSET parameter. Set it based on instructions provided in Table 1.

Value range: Boolean

  • on indicates that the execution plan of the statement can be pushed.
  • off indicates that the execution plan of the statement cannot be pushed.

Default value: off

NOTE:

This parameter is used for internal O&M. Do not set it to on unless absolutely necessary.

lc_collate

Parameter description: Specifies the locale in which sorting of textual data is done.

This parameter is a fixed INTERNAL parameter and cannot be modified.

Default value: Determined by the configuration set during the cluster installation and deployment.

lc_ctype

Parameter description: Specifies the locale that determines character classifications. For example, it specifies what a letter and its upper-case equivalent are.

This parameter is a fixed INTERNAL parameter and cannot be modified.

Default value: Determined by the configuration set during the cluster installation and deployment.

max_identifier_length

Parameter description: Specifies the maximum identifier length.

This parameter is a fixed INTERNAL parameter and cannot be modified.

Value range: an integer

Default value: 63

server_encoding

Parameter description: Specifies the database encoding (character set).

This parameter is a fixed INTERNAL parameter and cannot be modified.

Default value: Determined when the database is created.

enable_upgrade_merge_lock_mode

Parameter description: If this parameter is set to on, the delta merge operation internally increases the lock level, and errors can be prevented when update and delete operations are performed at the same time.

This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.

Value range: Boolean

  • If this parameter is set to on, the delta merge operation internally increases the lock level. In this way, when the DELTAMERGE operation is concurrently performed with the UPDATE or DELETE operation, one operation can be performed only after the previous one is complete.
  • If this parameter is set to off and the DELTAMERGE operation is concurrently performed with the UPDATE or DELETE operation to the data in a row in the delta table of the table, errors will be reported during the later operation, and the operation will stop.

Default value: off

transparent_encrypted_string

Parameter description: Specifies a sample string that is transparently encrypted. Its value is generated by encrypting TRANS_ENCRYPT_SAMPLE_STRING using a database secret key. The ciphertext is used to check whether the DEK obtained during secondary startup is correct. If the DEK is incorrect, CNs and DNs reject the startup. This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1. This parameter applies only to the DWS scenario in the current version.

Value range: a string. An empty string indicates that the entire cluster is encrypted.

Default value: empty

NOTE:

Do not set this parameter manually. Otherwise, the cluster may become faulty.

transparent_encrypt_kms_url

Parameter description: Specifies the URL for obtaining the database secret key to be transparently encrypted. It must contain only the characters specified in RFC3986, and the maximum length is 2047 bytes. The format is kms://Protocol@KMS host name 1;KMS host name 2:KMS port number/kms, for example, kms://https@linux175:29800/. This parameter applies only to the DWS scenario in the current version.

This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1.

Value range: a string

Default value: empty

transparent_encrypt_kms_region

Parameter description: Specifies the deployment region of the entire cluster. It must contain only the characters specified in RFC 3986, and the maximum length is 2,047 bytes. This parameter applies only to the DWS scenario in the current version.

This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1.

Value range: a string

Default value: empty

datanode_heartbeat_interval

Parameter description: Specifies the interval at which heartbeat messages are sent between heartbeat threads. You are advised to set this parameter to a value no more than wal_receiver_timeout/2.

This parameter is a SIGHUP parameter. Set it based on instructions provided in Table 1.

Value range: an integer ranging from 1000 to 60000. The unit is ms.

Default value: 1s

dfs_partition_directory_length

Parameter description: Specifies the maximum directory name length for the partition directory of a table partitioned by VALUE in the HDFS.

This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.

Value range: 92 to 7999

Default value: 512

max_concurrent_autonomous_transactions

Parameter description: Specifies the maximum number of autonomous transaction connections, that is, the maximum number of concurrent autonomous transactions executed at the same time. If this parameter is set to 0, autonomous transactions cannot be executed.

This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1.

Value range: 0–1024

Default value: 10

mot_config_file

This parameter is unavailable in a distributed system.

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