Changes the node specifications of a specified PolarDB cluster.


OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer. OpenAPI Explorer dynamically generates the sample code of the operation for different SDKs.

Request parameters

Parameter Position Type Required Example Description
Action Query String No ModifyDBNodeClass

The operation that you want to perform. Set the value to ModifyDBNodeClass.

DBClusterId Query String Yes pc-*************

The ID of the PolarDB cluster.

DBNodeTargetClass Query String Yes polar.mysql.x4.large

For more information about the node specifications, see Specifications and pricing.

ModifyType Query String Yes Upgrade

The type of the change. Valid values:

  • Upgrade
  • Downgrade
ClientToken Query String No 6000170000591aed949d0f54a343f1a4233c1e7d1c5c******

The client token that is used to ensure the idempotency of requests. If an API operation is idempotent, the API operation returns the same result for identical requests. You can use the client to generate the value. Make sure that the value is unique for different requests. The token is case-sensitive. The token can contain only ASCII characters and cannot exceed 64 characters in length.

Response parameters

Parameter Type Example Description
DBClusterId String pc-*************

The ID of the PolarDB cluster.

OrderId String 2035629******

The ID of the order.

RequestId String 685F028C-4FCD-407D-A559-072D63******

The ID of the request.


Sample requests

http(s):// Action=ModifyDBNodeClass
&<Common request parameters>

Sample success responses

XML format


JSON format

    "RequestId": "685F028C-4FCD-407D-A559-072D6378C4C3",
    "OrderId": "2035629******",
    "DBClusterId": "pc-**************"

Error codes

For a list of error codes, visit the API Error Center.