Help Center
Document Database Service
Product Introduction
Overview
Resource Pool and Feature Overview
List of Resource Pools
Product Features and Supported Resource Pools at a Glance
Architecture
Single-Node System Architecture
Replica Set System Architecture
Cluster System Architecture
Product Advantages
Ease of Use
High Availability
High reliability
Security
Product Features
Three Architectures
Elastic Scaling
Key Product Features
Application Scenarios
DDS is applied in the following scenarios
Instance Description
Database Instance Specifications
Database Engine and Version
Terms
Regions and Resource Pools
Availability Zone
DDS Instances
Parameter Templates and Parameter Groups
Count of Database Connections
Cluster
Replica Set
Relationships with Other Cloud Services
Advantages of DDS over Self-built Database
Billing
Billing Description
Billing Items
Charging Standards
Billing Mode
Yearly and Monthly Subscription
Pay-As-You-Go
Billing Item
Instance Renewal
Constraints and Rules
Procedure
Instance Unsubscription
Procedure
Switching the Billing Mode from Pay-as-you-go to Subscription-based
Procedure
Constraints
Procedure
Switching the Billing Mode from Subscription-based to Pay-as-you-go
Procedure
Constraints
Procedure
Getting Started
Overview
Three Specification Types and Application Scenarios
Creating and Connecting Database
Creating a DDS Instance
Connecting a DDS Instance
Introduction to Instance Connection Method
Connecting an Instance Through Intranet
Setting a Security Group
Connecting an Instance Through Mongo Shell in the Intranet
Connecting Instances Through Internet
Binding and Unbinding an EIP
Setting a Security Group
Connecting an Instance Through Mongo Shell in the Internet
Connecting an Instance Using Program Codes
Python Examples
Java Example
Steps to Use DDS
Using DDS in Intranet
Using DDS in Internet
User Guide
Logging in to DDS
Before You Begin
Logging in to the Console from Control Center
Logging in to the Console from the Product Details Page
Instance Management
Instance Creation
Instance Unsubscription
Instance Restart
Changing Instance Configuration
Changing Configuration Parameters
Database Account Management
Managing Permissions of Master Accounts, Sub-accounts and IAM
Enterprise Project Migration
Modify Instance Name
Upgrade the kernel patch version
Instance Recycle Bin
Instance Change
Instance Disk Expansion
Expanding Instance Specifications
Adding Nodes for Sharded Cluster Instances
Adding Nodes for Replica Set Instances
Active-Standby Switchover of Instances
Set Maintenance Time Window
Enabling or Disabling Instance Release
Backup Management
Data Backup Scheme
Auto Backup
Manual Backup
Incremental Backup
View Backup Result
Delete a Backup
Recovery Management
Recovery Scheme
Recovering Stand-alone Version Instance Backup
Recovering Replica Set Instance Backup
Recovering Cluster Version Instance Backup
View Restore Records
Parameter Group Management
What is Parameter Group
Create Parameter Group
Modify Parameter Group
Compare Parameter Group
Copy Parameter Group
Restore Parameter Group
Apply Parameter Group
View Parameter History
Delete Parameter Group
Export Parameter
Monitoring Management
View Monitoring Information
Introduction to Monitoring Metrics
Alarm Settings
Alarm Center
Event Management
Log Management
Viewing Error Log Information
Viewing Slow Query Log Information
Viewing Running Log Information
Account Management
Creating Regular Account
Modify Permission of Regular Account
Reset Account Password
Deleting Regular Account
Managing Tags
Create Tag
Binding a Tag to an Instance
Filtering Instances by Tags
Unbinding an Instance from a Tag
Delete Tag
Task List
Instance Lifecycle Management
Instance Status
Export Instance List
Restarting Instance or Node
Deleting Instance As Needed
Database Management
Modify Instance Port
Creating an Instance Account
Creating a database
Enabling and Disabling SSL
Resetting Administrator Password
Edit Security Group
Supported and Unsupported Commands
Data Migration
Migration Solution Overview
Migrating Data Using mongodump and mongorestore
Disaster Recovery Across Availability Zones
Activating Across-AZ Replica Set Instance
Activating Across-AZ Cluster Instance
Fine-tuning
Adjusting Parameters to Optimize Performance
Improving Read/Write Performance of Database
Troubleshooting of High CPU Usage
Troubleshooting of High Disk Usage
Troubleshooting of High Memory Usage
Troubleshooting of Load Unbalance of Cluster Instance
Methods to Locate Slow Requests
Methods to Optimize Database Query Language
Improving Performance with Sharding
Trustlist Management
Add Trustlist Group
Modify Trustlist Group
Delete Trustlist Group
Usage Suggestions of DDS
Design Specifications of DDS
Development Suggestions of DDS
API Reference
API Overview
Overview
API Overview
Status Code
Call APIs
Construct a Request
Endpoint
Authentication
API
Security Group Management
Performance Monitoring
Log Management
Instance Management
Buy a New MongoDB Instance
Query the Monitoring Metric Collection Granularity of an Instance
View the Cluster Instance List
Set the Monitoring Metric Collection Granularity of an Instance
Expand a MongoDB Instance
Reset the Password of the Root Account in an Instance
Query the Renewal Price of a MongoDB Instance
Unbind the Elastic IP of the instance
Query the Connection Address Information of an Instance
Query Instance SSL Setting Details of an Instance
View the Instance List
Query the Role Information of an Instance
Query Instance Details
Modify Instance Name
Query the overview information of one or more MongoDB instances
Modify the Remark of the Root Account in an Instance
Release an Instance
Query the maintenance time of the instance
Query All Database Account Information of an Instance
Query the O&M task type of the instance and the number of tasks of each type
Restart a Database Instance
Query the Task List Information
Restore a Released Instance
Query the Database Root Account Information of an Instance
Modify the maintainable time of the instance
Destroy a Released Instance
Modify instance SSL configuration
Query the Number of O&M Tasks in an Instance
Unsubscribe from a MongoDB Instance
Renew a MongoDB instance
Query the Price of a Newly Purchased MongoDB Instance
Query the Expansion Price of a MongoDB Instance
Backup and Restoration
Check Whether an Instance Meets the Data Recovery Condition
Modify the Backup Policy of an Instance
Query the Backup List of an Instance
Query the Backup Policy of an Instance
Manually Backing Up an Instance
Manually Restore an Instance
Parameter Management
Query the Parameter Configuration Information of an Instance
Query All Parameter Groups
Query the Default Parameter Template List of an Instance
Delete Parameter Group
Query the Parameter Revision History of an Instance
Create a New Parameter Group
Modify the parameters of a MongoDB instance
Copy Parameter Group
Restore Parameter Group
Compare Parameter Groups
Managing Tags
Create Tag
Query the Binding Relationship Between an Instance and Tags
Bind One or More Tags
Unbind Bound Tags
Query All Tag Data Information
Alarm Center
Query the Server Alarm Rule of an Instance
Query the Database Alarm Configuration of an Instance
Query the Alarm List Information
Query the Alarm History Information
Modify the Server Alarm Rule of an Instance
Modify the Database Alarm Rule of an Instance
Change History
Best Practices
Overview
Improve Service Performance with Data Sharding
Create sharded table
Configure balancer window
Improve Instance Performance with SQL Optimization
Ways to improve the performance of query operation
Commonly Used DDS Indexes
Slow query locating and processing
Clean up unnecessary indexes
Do not use system library to store business data
Common methods for importing and exporting data
mongoexport/mongoimport method
mongodump/mongorestore method
Improve Performance with read/write Separation
Node role description
Read the specified node by setting readPreference
Improve data security by configuring write parameters
How to Connect to Document Database
Connect using mongo shell
Connect using mongo driver
Allocate user permissions properly to ensure database security
Developer Guide
Specifications on Using DDS
Basic Command Specification for DDS
Specifications on Developing DDS
Specifications on Designing DDS
Use of Database
How to Connect to Database
How to Create and Manage Database
How to Create and Manage Collection
How to Create and Manage Index
Application Development
Development process
Java-based development
Python-based development
Database Permission Management
Default permission mechanism
Role Management
User Management
System collection
Common Operations
FAQs
Billing
Purchasing
Resources frozen/released/deleted/unsubscribed
Expansion and Specification Changes
Create and Delete
Operation
Database Version
Resource and Disk Management
Database Performance
Permission
Database Connection
Client Installation
Basic Use of Database
Database Migration
Database Parameter
Backup and Restoration
Network security
Monitoring and Alarm
Consulting
Troubleshooting
Overview
Instance Node Troubleshooting
Connection error: Authentication failed
Connection error: Connection failed or service unreachable
Access instance error: no primary node
Connection error: URL without replica set configuration
Connection error: Timeout
Performance Whitepaper
Overview
Test Methods
Replica Set Test Data
Sharded Cluster Test Data
Security Whitepaper
Overview of Security Whitepaper
Download
Download
Related Agreements
Related Agreements
Help Center
Document Database Service
Best Practices
Improve Performance with read/write Separation
Improve Performance with read/write Separation
2025-07-28 06:28:12
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Node role description
Read the specified node by setting readPreference
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