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

Automatic Cleanup

Updated on 2022-08-16 GMT+08:00

The automatic cleanup process (autovacuum) in the system automatically runs the VACUUM and ANALYZE commands to recycle the record space marked by the deleted status and update statistics in the table.

autovacuum

Parameter description: Enables the automatic cleanup process (autovacuum) in the database. Ensure that the track_counts parameter is set to on before enabling the automatic cleanup process.

Type: SIGHUP

NOTE:
  • Set the autovacuum parameter to on if you want to enable the function to automatically clean up two-phase transactions after the system recovers from faults.
  • If autovacuum is set to on and the value of autovacuum_max_workers is 0, the system will not automatically clean up two-phase transactions. The system will clean up them after recovering from faults.
  • If autovacuum is set to on and the value of autovacuum_max_workers is greater than 0, the system will automatically clean up the two-phase transactions and processes after recovering from faults.
NOTICE:

Even if the autovacuum parameter is set to off, the automatic cleanup process will be enabled automatically by the database when a transaction ID wrap is about to occur. When the create database or drop database operation fails, some nodes may be submitted or rolled back while others in the prepared status may not be submitted. In this case, the system cannot automatically restore these nodes and the manual restoration is required. The restoration steps are as follows:

  1. Use the gs_clean tool (setting the option parameter to -N) to query the xid of the abnormal two-phase transactions and nodes in the prepared state.
  2. Log in to the nodes whose transactions are in the prepared status. Administrators connect to an available database such as gaussdb to run the set xc_maintenance_mode = on statement.
  3. Submit or roll back the two-phase transactions (for example, submit or roll back a statement) based on global transaction status.

Value range: Boolean

  • on indicates the database automatic cleanup process is enabled.
  • off indicates the database automatic cleanup process is disabled.

Default value: off

autovacuum_mode

Parameter description: Specifies whether the autoanalyze or autovacuum function is enabled. This parameter is valid only when autovacuum is set to on.

Type: SIGHUP

Value range: enumerated values

  • analyze indicates that only autoanalyze is performed.
  • vacuum indicates that only autovacuum is performed.
  • mix indicates that both autoanalyze and autovacuum are performed.
  • none indicates that neither of them is performed.

Default value: mix

autoanalyze_timeout

Parameter description: Specifies the timeout period of autoanalyze. If the duration of autoanalyze on a table exceeds the value of autoanalyze_timeout, the autoanalyze is automatically canceled.

Type: SIGHUP

Value range: an integer ranging from 0 to 2147483. The unit is second.

Default value: 5min

autovacuum_io_limits

Parameter description: Specifies the upper limit of I/Os triggered by the autovacuum process per second.

Type: SIGHUP

Value range: an integer ranging from –1 to 1073741823. –1 indicates that the default Cgroup is used.

Default value: –1

log_autovacuum_min_duration

Parameter description: Records each step performed by the automatic cleanup process to the server log when the execution time of the automatic cleanup process is greater than or equal to a certain value. This parameter helps track the automatic cleanup behaviors.

Type: SIGHUP

For example, set the log_autovacuum_min_duration parameter to 250 ms to record the information related to the automatic cleanup commands running the parameters whose values are greater than or equal to 250 ms.

Value range: an integer ranging from –1 to INT_MAX. The unit is ms.

  • If this parameter is set to 0, all the automatic cleanup operations are recorded in the log.
  • If this parameter is set to –1, all the automatic cleanup operations are not recorded in the log.
  • If this parameter is not set to –1, an automatic cleanup operation is skipped and a message is recorded due to lock conflicts.

Default value: –1

autovacuum_max_workers

Parameter description: Specifies the maximum number of automatic cleanup threads running at the same time.

Type: POSTMASTER

Value range: an integer ranging from 0 to 262143. 0 indicates that autovacuum is disabled.

Default value: 3

autovacuum_naptime

Parameter description: Specifies the interval between two automatic cleanup operations.

Type: SIGHUP

Value range: an integer ranging from 1 to 2147483. The unit is second.

Default value: 10min

autovacuum_vacuum_threshold

Parameter description: Specifies the threshold for triggering the VACUUM operation. When the number of deleted or updated records in a table exceeds the specified threshold, the VACUUM operation is executed on this table.

Type: SIGHUP

Value range: an integer ranging from 0 to INT_MAX

Default value: 50

autovacuum_analyze_threshold

Parameter description: Specifies the threshold for triggering the ANALYZE operation. When the number of deleted, inserted, or updated records in a table exceeds the specified threshold, the ANALYZE operation is executed on this table.

Type: SIGHUP

Value range: an integer ranging from 0 to INT_MAX

Default value: 50

autovacuum_vacuum_scale_factor

Parameter description: Specifies the size scaling factor of a table added to the autovacuum_vacuum_threshold parameter when a VACUUM event is triggered.

Type: SIGHUP

Value range: a floating point number ranging from 0.0 to 100.0

Default value: 0.2

autovacuum_analyze_scale_factor

Parameter description: Specifies the size scaling factor of a table added to the autovacuum_analyze_threshold parameter when an ANALYZE event is triggered.

Type: SIGHUP

Value range: a floating point number ranging from 0.0 to 100.0

Default value: 0.1

autovacuum_freeze_max_age

Parameter description: Specifies the maximum age (in transactions) that a table's pg_class.relfrozenxid column can attain before a VACUUM operation is forced to prevent transaction ID wraparound within the table.

The old files under the subdirectory of pg_clog/ can also be deleted by the VACUUM operation. Even if the automatic cleanup process is forbidden, the system will invoke the automatic cleanup process to prevent the cyclic repetition.

Type: POSTMASTER

Value range: an integer ranging from 100000 to 576460752303423487

Default value: 20000000000

autovacuum_vacuum_cost_delay

Parameter description: Specifies the value of the cost delay used in the autovacuum operation.

Type: SIGHUP

Value range: an integer ranging from –1 to 100. The unit is ms. -1 indicates that the normal vacuum cost delay is used.

Default value: 20ms

autovacuum_vacuum_cost_limit

Parameter description: Specifies the value of the cost limit used in the autovacuum operation.

Type: SIGHUP

Value range: an integer ranging from –1 to 10000. -1 indicates that the normal vacuum cost limit is used.

Default value: –1

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