- What's New
- Function Overview
- Service Overview
-
Getting Started
- Overview
- Getting Started with Clusters
- Getting Started with Replica Sets
- Getting Started with Single Nodes
- Logging In to the DDS Console
- Example: Buying and Connecting to a DDS Instance
- Change History (Getting Started) Europe Site
-
User Guide
- Migrating Data
- Performance Tuning
- Permissions Management
- Instance Lifecycle Management
- Instance Modifications
- Data Backups
- Data Restorations
-
Parameter Template Management
- Overview
- Creating a Parameter Template
- Modifying a Parameter Template
- Viewing Parameter Change History
- Exporting a Parameter Template
- Comparing Parameter Templates
- Replicating a Parameter Template
- Resetting a Parameter Template
- Applying a Parameter Template
- Viewing Application Records of a Parameter Template
- Modifying the Description of a Parameter Template
- Deleting a Parameter Template
- Connection Management
- Database Usage
- Data Security
- Monitoring and Alarm Reporting
- Auditing
- Logs
- Task Center
- Billing
- Tags
- Quotas
- DDS Usage Suggestions
- Change History
- Developer Guide
-
Best Practices
- Overview
- Common Methods for Connecting to a DDS Instance
- How Do Replica Sets Achieve High Availability and Read/Write Splitting?
- Sharding
- How Do I Improve DDS Performance by Optimizing SQL Statements?
- How Do I Prevent the Mongos Cache Problem?
- How Do I Solve the High CPU Usage Issue?
- Creating a User and Granting the Read-Only Permission to the User
- Security White Paper
- Performance White Paper
-
API Reference
- Before You Start
- API Overview
- Calling APIs
- Getting Started
-
APIs V3.0 (Recommended)
- Querying the API Version
- Querying Database Version Information
- Querying Database Specifications
- Querying the Database Disk Type
-
DB Instance Management
- Creating a DB Instance
- Restarting a DB Instance
- Deleting a DB Instance
- Querying Instances and Details
- Scaling Up Storage Space
- Adding Nodes for a Cluster Instance
- Modifying DB Instance Specifications
- Performing a Primary/Secondary Switchover in a Replica Set Instance
- Enabling or Disabling SSL
- Modifying a DB Instance Name
- Changing an Instance Description
- Changing a Database Port
- Changing a Security Group
- Binding an EIP
- Unbinding an EIP
- Changing a Private IP Address
- Creating Shard or Config IP Addresses of a Cluster Instance
- Configuring Cross-CIDR Access for a Replica Set
- Querying AZs to Which an Instance Can Be Migrated
- Migrating a DB Instance to Another AZ
- Adding Nodes to a Replica Set Instance
- Adding a Read Replica to an Instance
- Connection Management
-
Backup and Restoration
- Creating a Manual Backup
- Deleting a Manual Backup
- Querying the Backup List
- Querying an Automated Backup Policy
- Setting an Automated Backup Policy
- Restoring Data to a New DB Instance
- Obtaining the Link for Downloading a Backup File
- Querying the Restoration Time Ranges
- Obtaining the List of Databases That Can Be Restored
- Obtaining the List of Database Collections That Can Be Restored
- Restoring Data to the Original DB Instance
- Restoring Databases and Tables to a Point in Time
- Parameter Configuration
- Log Information Queries
- Tag Management
-
Managing Databases and Users
- Creating a Database User
- Creating a Database Role
- Querying Details About Database Users
- Querying the Database Role List
- Changing the Password of a Database User
- Checking the Password for Logging In to a Database
- Querying Cluster Balancing Settings
- Enabling or Disabling Cluster Balancing
- Setting the Activity Time Window for Cluster Balancing
- Deleting a Database User
- Deleting a Database Role
- Quota Management
- Task Management
- API V3 (Unavailable Soon)
- Examples
- Permissions Policies and Supported Actions
- Appendix
- Change History (European Sites)
- SDK Reference
-
FAQs
-
Product Consulting
- What Is the Relationship Between DDS and MongoDB Community Edition?
- What Are the Differences Between DDS and GaussDB(for Mongo)?
- What Precautions Should Be Taken When Using DDS?
- What Is the Availability of DDS DB Instances?
- Will My DDS DB Instances Be Affected by Other Users' DDS DB Instances?
- Does DDS Support Multi-AZ Deployment?
- Can I Change the VPC for a Created Instance?
- Can I Change the Region for a Created Instance?
- What Is Hidden Node?
- Database Versions
-
Resource and Disk Management
- Which Items Occupy the Storage Space of DDS Instances?
- Which Types of Logs and Files Occupy DDS DB Instance Storage Space?
- Why Is the Storage Space Usage Displayed on the GUI Smaller Than the Actual Usage?
- Why Does Available Disk Space Not Increase After Data Is Deleted?
- Why Is the Resident Memory of a 4 vCPUs/8 GB Memory Replica Set Instance Only 4 GB?
- Capacity Expansion and Specification Changes
-
Database Performance
- When Will a Primary/Standby Switchover Be Triggered for a Cluster or Replica Set?
- High Storage Usage
- What Is the Time Delay for Primary/Secondary Synchronization in a Replica Set?
- How Is Data Transferred Between the Primary and Secondary Nodes of a Replica Set?
- How Do I Clear an Alarm Saying the Shard Memory Usage Exceeds 90%?
- What Can I Do If a Query Error Is Reported After Data Is Written Into the DDS Cluster?
- Database Permissions
-
Creation and Deletion
- How Do I Select Instance Specifications and Nodes?
- Why Is an Instance Not Displayed on the Console After It Is Created?
- Can I Use a Template to Create DDS DB Instances?
- Why Is Data Missing from My Database?
- Will My Backups Be Deleted If I Delete My Cloud Account?
- What Are the Differences Between Instance Deletion and Unsubscription?
-
Database Connection
- What Should I Do If I Fail to Connect to a DDS Instance?
- What Can I Do If the Number of Connections of an Instance Reaches Its Maximum?
- How Do I Query and Limit the Number of Connections?
- What Should I Do If the ECS and DDS Are Deployed in Different VPCs and They Cannot Communicate with Each Other?
- Do Applications Need to Support Automatic Reconnecting to the DDS Database?
- How Do I Create and Log In to an ECS?
- Installing a Client
- Database Usage
- Database Migration
- Database Storage
- Database Parameters
- Backup and Restoration
- Network Security
- Monitoring and Alarm
- Change History (FAQs) Europe Site
-
Product Consulting
-
Troubleshooting
- DDS Instance Node Fault Handling Mechanism
- Connection Failure Message: network error while attempting to run command 'isMaster'
- Connection Failure Messages: No route to host and connection attempt failed
- Connection Failure Message: Authentication failed
- Connection Failure Message: couldn't connect to server
- Connection Failure Message: cannot list multiple servers in URL without 'replicaSet' option
- Connection Failure Message: Timeout while receiving message
- Connection Failure Message: exception: login failed and U_STRINGPREP_PROHIBITED_ERROR
- Change History (Troubleshooting) European Sites
- Videos
Modifying a Parameter Template
You can modify parameters in custom parameter templates as needed to get the most out of DDS performance.
You can modify parameters in either of the following ways:
- Directly modify the parameters of a specified instance.
If you change a dynamic parameter value in a parameter template and save the change, the change takes effect immediately regardless of the Effective upon Reboot setting. If you modify static parameters on the Parameters page of an instance and save the modifications, the modifications take effect only after you manually restart the target instance.
- Modify the parameters in a parameter template and apply the template to the instance.
The changes only take effect after you apply the template to the instance. If you modify static parameters in a custom parameter template on the Parameter Template Management page and save the modifications, the modifications take effect only after you apply the parameter template to instances and manually restart the instances. For details about how to apply a parameter template to instances, see Applying a Parameter Template.
Precautions
- You can change parameter values in custom parameter templates but cannot change the default parameter templates provided by the system. You can only click the name of a default parameter template to view its details.
- If a custom parameter template is set incorrectly, the instance associated with the template may fail to start. You can re-configure the custom parameter template according to the configurations of the default parameter template.
Modifying Parameters of an Instance
- Log in to the management console.
- Click
in the upper left corner and select a region and a project.
- Click
in the upper left corner of the page and choose Databases > Document Database Service.
- In the navigation pane on the left, choose Instances. On the displayed page, click the DB instance whose parameters you wish to modify.
- In the navigation pane on the left, choose Parameters. On the displayed page, modify parameters as required.
- Modify parameters based on the DB instance type.
- If the DB instance is a cluster instance, select mongos, shard, or config on the Parameters page and change the value of net.maxIncomingConnections, which indicates maximum number of concurrent connections that mongos or mongod can be connected.
Enter net.maxIncomingConnections in the search box in the upper right corner of the page and click the search icon to search for this parameter.
- If the DB instance is a read replica instance, change the value of net.maxIncomingConnections, which indicates maximum number of concurrent connections that mongos or mongod can be connected.
Enter net.maxIncomingConnections in the search box in the upper right corner of the page and click the search icon to search for this parameter.
- If the DB instance is a single node instance, change the value of net.maxIncomingConnections, which indicates maximum number of concurrent connections that mongos or mongod can be connected.
Enter net.maxIncomingConnections in the search box in the upper right corner of the page and click the search icon to search for this parameter.
- If the DB instance is a cluster instance, select mongos, shard, or config on the Parameters page and change the value of net.maxIncomingConnections, which indicates maximum number of concurrent connections that mongos or mongod can be connected.
- Change the maximum number of connections based on the parameter value range and instance specifications. This default value depends on the DB instance specifications. This parameter is displayed as default before being set, indicating that the parameter value varies with the memory specifications. For details about the parameters, see Parameters.
- To save the changes, click Save.
- If you want to cancel the modifications, click Cancel.
- If you want to preview the modifications, click Preview.
- After the parameters have been modified, click Change History to view parameter modification details. For details, see Viewing Change History of DB Instance Parameters.
NOTICE:
Check the value in the Effective upon Restart column. If it is set to:- Yes: If an instance status on the Instances page is Pending restart, the instance needs to be restarted to apply changes.
- No: The changes are applied immediately.
Modifying Parameters in a Custom Parameter Template
- Log in to the management console.
- Click
in the upper left corner and select a region and a project.
- Click
in the upper left corner of the page and choose Databases > Document Database Service.
- In the navigation pane on the left, choose Parameter Templates.
- On the Parameter Templates page, click Custom Templates. Locate the target parameter template and click its name.
- Modify the required parameters.
For parameter description details, see Parameters.
- If you want to save the modifications, click Save.
- If you want to cancel the modifications, click Cancel.
- If you want to preview the modifications, click Preview.
- The modifications take effect only after you apply the parameter template to instances. For details, see Applying a Parameter Template.
NOTICE:
- After the parameters have been modified, click Change History to view parameter modification details. For details, see Viewing Change History of a Custom Parameter Template.
- The change history page displays only the modifications of the last seven days.
- For details about the parameter template statuses, see Parameter Template Status.
- After modifying a parameter, view the associated instance status in the instance list. If Pending restart is displayed, restart the instance for the modification to take effect.
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