Buying a DDM Instance

Prerequisites

You have logged in to the DDM console.

Procedure

1. On the displayed page, in the upper right corner, click Buy DDM Instance.
2. On the displayed page, configure the required parameters.

   Table 1 Parameter description

   Parameter	Description
   Billing Mode	DDM instance billing mode, which can be Yearly/Monthly or Pay-per-use. Yearly/Monthly: Specify a required duration. The system will deduct the fees incurred from your account based on the service price. Pay-per-use: Do not specify any required duration because the system deducts the fees incurred from your account every hour based on how much the service is used.
   Region	Region where the DDM instance is located. Select the required region.
   AZ	Availability zone where the DDM instance is deployed. Nodes in a DDM instance can be deployed on different physical servers in the same AZ to keep services always available even if one physical server becomes faulty. A DDM instance can be deployed across AZs to provide cross-AZ DR. If necessary, you can select multiple AZs when you create a DDM instance. Then nodes of the instance will be deployed in multiple different AZs. NOTE: Deploy your application, DDM instance, and required RDS instances in the same AZ to reduce network latency. Cross-AZ deployment may increase network latency.
   Instance Name	Name of the DDM instance, which: Cannot be left blank. Must start with a letter. Must be 4 to 64 characters long. Can contain only letters, digits, and hyphens (-). Cannot contain other special characters.
   Node Class	Class of the DDM instance. You can select general-enhanced (x86) or Kunpeng general computing-plus (Arm). NOTE: Estimate compute and storage requirements of your applications based on your service type and scale before you buy a DDM instance, and then select an appropriate class so that the CPU and memory specifications of your DDM instance can better meet your needs.
   Instance Nodes	Number of nodes for deploying the DDM instance. You can apply for up to 32 nodes at a time.
   VPC	VPC that the DDM instance belongs to. This VPC isolates networks for different services. It allows you to manage and configure private networks, simplifying network management. Click View VPC to show more details and security group rules. NOTE: The DDM instance should be in the same VPC as the required data nodes. After a DDM instance is created, the VPC cannot be changed.
   Security Group	Select an existing security group. The same security group is recommended for your DDM instance, application, and required data nodes so that network access is not restricted. If different security groups are selected, add security group access rules to enable such network access.
   Parameter Template	A parameter template acts as a container for engine configuration values that can be applied to one or more DDM instances. You can modify parameters in a parameter template to manage configurations of the DDM instance that the template applies to.
   Enterprise Project	EPS provides a unified method to manage cloud resources and personnel by enterprise project.
   Tags	Tags can be added to instances to help you manage instances and collect expense data.
   Required Duration	Duration of the DDM instance. This parameter is available only if Billing Mode is set to Yearly/Monthly. You can select 1 month, 2 months, 3 months, 4 months, 5 months, 6 months, 7 months, 8 months, 9 months, 1 year, 2 years, or 3 years. If you select Auto-renew, the renew cycle is the same as the selected duration.

3. After the configuration is complete, click Next at the bottom of the page.
4. Perform subsequent operations based on the billing mode you select:
   • If you select pay-per-use, click Submit.
   • If you select yearly/monthly, click Pay Now.