Updated on 2026-03-16 GMT+08:00

Changing DB Instance Specifications

Function

This API is used to change DB instance specifications. Before calling this API:

Learn how to authenticate it.
Obtain the required region and endpoint.

URI

POST /v3/{project_id}/instances/{instance_id}/action

**Table 1** URI parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Definition Project ID of a tenant in a region. To obtain this value, see Obtaining a Project ID. Constraints N/A Range The value contains 32 characters. Only letters and digits are allowed. Default Value N/A
instance_id	Yes	String	Definition Instance ID, which uniquely identifies an instance. Constraints N/A Range The value contains 36 characters with a suffix of in07. Only letters and digits are allowed. Default Value N/A

Request Parameters

**Table 2** Request header parameters
Parameter	Mandatory	Type	Description
X-Auth-Token	Yes	String	Definition User token. To obtain this value, call the IAM API for obtaining a user token. The value of X-Subject-Token in the response header is the token value. Constraints N/A Range N/A Default Value N/A
X-Language	No	String	Definition Request language type. Constraints N/A Range en-us zh-cn Default Value en-us

**Table 3** Request body parameters
Parameter	Mandatory	Type	Description
resize_flavor	Yes	MysqlResizeFlavor object	Definition Specification change information. Constraints N/A
is_auto_pay	No	String	Definition Whether the order will be automatically paid when the specifications of yearly/monthly instances are changed. Constraints N/A Range true (default value): The order will be automatically paid from your account. false: The order will be manually paid. Default Value N/A

**Table 4** MysqlResizeFlavor
Parameter	Mandatory	Type	Description
spec_code	Yes	String	Definition Specification code. For details, see spec_code in Table 5 in Querying Database Specifications. Constraints N/A Range N/A Default Value N/A

Response Parameters

Status code: 200

**Table 5** Response body parameters
Parameter	Type	Description
job_id	String	Definition ID of the task of changing instance specifications.This parameter is returned only for pay-per-use instances. Range N/A
order_id	String	Definition Order ID. This parameter is returned only for yearly/monthly instances. Range N/A

Status code: 400

**Table 6** Response body parameters
Parameter	Type	Description
error_code	String	Error code.
error_msg	String	Error message.

Status code: 500

**Table 7** Response body parameters
Parameter	Type	Description
error_code	String	Error code.
error_msg	String	Error message.

Example Request

Changing the specifications of a DB instance to 4 vCPUs and 32 GB memory

POST https://{endpoint}/v3/054e292c9880d4992f02c0196d3ea468/instances/ba62a0b83a1b42bfab275829d86ac0fdin07/action
{
  "resize_flavor" : {
    "spec_code" : "gaussdb.mysql.xlarge.arm.8"
  }
}

Example Response

Status code: 200

Success.

{
  "job_id" : "dff1d289-4d03-4942-8b9f-463ea07c000d"
}

Status Code

For details, see Status Codes.

Error Code

For details, see Error Codes.

Parent topic: Instance Management