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PolarDB:UpdatePrivateRdsClass

Last Updated:Jul 10, 2026

Upgrades or downgrades the specifications of a storage-layer custom ApsaraDB RDS instance.

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RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

  • Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.

  • API: The API that you can call to perform the action.

  • Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.

  • Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.

    • For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.

    • For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.

  • Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.

  • Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

drds:UpdatePrivateRdsClass

update

*All Resource

*

None None

Request parameters

Parameter

Type

Required

Description

Example

RdsClass

string

No

The specification code of the storage-layer custom ApsaraDB RDS instance after the update.

Note

You can call the DescribeAvailableClasses operation to query the available specifications of storage-layer custom ApsaraDB RDS instances, including specification codes and storage capacity ranges.

rds.mysql.c1.xlarge

DrdsInstanceId

string

Yes

The DRDS instance ID.

Note

You can call the DescribeDrdsInstances operation to query the details of all instances under the target account, including instance IDs.

drds*************

DBInstanceId

string

Yes

The ID of the storage-layer custom ApsaraDB RDS instance.

> You can call the DescribeDrdsRdsInstances operation to query the details of all storage-layer ApsaraDB RDS instances under the target DRDS instance, including instance IDs..

rm-***************

Storage

string

No

The storage capacity of the storage-layer custom ApsaraDB RDS instance after the update.

Note

You can call the DescribeAvailableClasses operation to query the available specifications of storage-layer custom ApsaraDB RDS instances, including specification codes and storage capacity ranges.

50

AutoUseCoupon

boolean

No

Specifies whether to use vouchers to offset the purchase cost. Valid values: true and false (default).

Note

After vouchers are used, if you need to downgrade the specifications, the amount offset by vouchers will not be refunded.

true

PrePayDuration

integer

No

Invalid field.

12

Response elements

Element

Type

Description

Example

object

Data

string

The order ID.

{ "orderId": "209136011******" }

RequestId

string

The request ID.

57D86AB4-8703-4DF4-BAB6-F7DE44******

Success

boolean

Indicates whether the request was successful.

true

Examples

Success response

JSON format

{
  "Data": "{     \"orderId\": \"209136011******\"   }",
  "RequestId": "57D86AB4-8703-4DF4-BAB6-F7DE44******",
  "Success": true
}

Error codes

HTTP status code

Error code

Error message

Description

500 ModifyRdsClassApiError Failed to modify the class of the RDS instance.
500 InternalError The request processing has failed due to some unknown error.

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.