Help Center/ Distributed Database Middleware/ API Reference/ APIs (Recommended)/ DDM Instances/ Changing the Node Class of a DDM Instance
Updated on 2026-06-05 GMT+08:00
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Changing the Node Class of a DDM Instance

Function

This API is used to change the node class of a DDM instance.

Constraints

  • The node class can be changed only when the corresponding DDM instance is normal.
  • The new node class cannot be the same as the original one.
  • Node classes of c6s series cannot be changed to those classes of c6 series.

URI

PUT /v3/{project_id}/instances/{instance_id}/flavor

Table 1 URI parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Project ID of a tenant in a region

To obtain this value, see Obtaining a Project ID.

instance_id

Yes

String

DDM instance ID

Request

Table 2 Request header parameters

Parameter

Mandatory

Type

Description

X-Auth-Token

Yes

String

User token

You can obtain the token by calling the IAM API used to obtain a user token.
Table 3 Request body parameters

Parameter

Mandatory

Type

Description

spec_code

Yes

String

Resource specification code of the new node class

group_id

No

String

This parameter is not required if the instance has only one node group. Each instance has one node group by default. If you need to create multiple node groups, set this parameter to the ID of the group whose node class you want to change.

is_auto_pay

No

Boolean

Whether the order is automatically paid when you change the node class of a yearly/monthly instance. This parameter does not affect the billing mode of automatic renewal. true: indicates that the order is automatically paid from the account. false: indicates that the order is manually paid from the account. The default value is false.

Example Request

Changing node class of a DDM instance to ddm.8xlarge.2

PUT https://{endpoint}/v3/{project_id}/instances/{instance_id}/flavor

{
  "spec_code" : "ddm.8xlarge.2",
  "group_id" : "3e5a9063d3b84729b0a3310fad3a0942gr09"
}

Response Parameters

  • Normal response
Table 4 Response body parameters

Parameter

Type

Description

job_id

String

ID of the task of changing node class. This parameter is returned only when you change the node class of a pay-per-use instance.

order_id

String

Order ID. This parameter is returned only when you change the node class of a yearly/monthly instance.

Example Response

  • Normal response example 
    {
  "job_id" : "2x414788a5112333a02390e2eb0ea227"
}
  • Abnormal response

    For details, see Abnormal Request Results.

Status Codes

Error Codes

For details, see Error Codes.

Parent topic: DDM Instances