All Products
Search

This Product

    Database Autonomy Service:ModifyAutoScalingConfig

    Document Center

    Database Autonomy Service:ModifyAutoScalingConfig

    Last Updated:Oct 19, 2026

    Modifies the elastic scaling configuration of an instance.

    Operation description

    This API operation allows you to modify the Automatic storage scaling, automatic storage expansion, bandwidth elastic scaling, and resource elastic scaling features of a database instance:

    • You can modify the specification elastic scaling feature for the following database instances:

    • You can modify the automatic storage expansion feature for the following database instances:

      • ApsaraDB RDS for MySQL high availability series cloud disk instance. For feature introduction and billing information, see automatic space expansion.

    • You can modify the bandwidth elastic scaling feature for the following database instances:

      • Tair (Redis® OSS-Compatible) classic (formerly local disk) instances. For feature introduction and billing information, see Automatic bandwidth adjustment.

    • You can modify the shard elastic scaling feature for the following database instances:

      • Tair (Redis® OSS-Compatible) cloud-native (formerly cloud disk) open-source edition in cluster architecture. For feature introduction and billing information, see Automatic shard addition.

    • You can modify the resource elastic scaling feature for the following database instances:

      • ApsaraDB RDS for MySQL high availability series local disk edition (general-purpose) and RDS Enterprise Edition (general-purpose). For feature introduction and billing information, see automatic scaling for performance optimization.

    • Use the latest version of the Alibaba Cloud or DAS SDK.

    • When you use the SDK to call DAS, set the region to cn-shanghai.

    • You can modify the specification elastic scaling feature for the following database instances:

    • You can modify the automatic storage expansion feature for the following database instances:

      • ApsaraDB RDS for MySQL high availability series cloud disk instance. For feature introduction and billing information, see automatic space expansion.

    • You can modify the bandwidth elastic scaling feature for the following database instances:

      • Tair (Redis® OSS-Compatible) classic (formerly local disk) instances. For feature introduction and billing information, see Automatic bandwidth adjustment.

    • You can modify the resource elastic scaling feature for the following database instances:

    • Use the latest version of the Alibaba Cloud or DAS SDK.

    • When you use the SDK to call DAS, set the region to cn-shanghai.

    Try it now

    Try this API in OpenAPI Explorer, no manual signing needed. Successful calls auto-generate SDK code matching your parameters. Download it with built-in credential security for local usage.

    Test

    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

    hdm:ModifyAutoScalingConfig

    update

    *All Resource

    *

    		 None None

    Request parameters

    Parameter

    Type

    Required

    Description

    Example
    InstanceId

    string

    Yes

    The instance ID.

    rm-2ze8g2am97624****
    Spec

    object

    No

    The configuration items for the specification elastic scaling feature.

    Apply

    boolean

    No

    Specifies whether to apply the configurations under the Spec configuration item for the specification elastic scaling feature:

    • true: Yes.

    • false: No.

    true
    Upgrade

    boolean

    No

    Specifies whether to enable automatic specification scale-up:

    • true: Yes.

    • false: No.

    true
    CpuUsageUpperThreshold

    integer

    No

    The threshold of average CPU utilization that triggers automatic specification scale-up. Unit: %. Valid values:

    • 50

    • 60

    • 70

    • 80

    • 90

    Important You must set this parameter when the target database instance is PolarDB for MySQL Cluster Edition or ApsaraDB RDS for MySQL high availability series cloud disk edition.

    Valid values:

    • 50 :

      50%

    • 60 :

      60%

    • 70 :

      70%

    • 80 :

      80%

    • 90 :

      90%

    70
    MemUsageUpperThreshold

    integer

    No

    The threshold of average memory utilization that triggers automatic specification scale-up. Unit: %. Valid values:

    • 50

    • 60

    • 70

    • 80

    • 90

    Important You must set this parameter when the target database instance is Tair (Redis® OSS-Compatible) cloud-native (formerly cloud disk) open-source edition on the China site.

    Valid values:

    • 50 :

      50%

    • 60 :

      60%

    • 70 :

      70%

    • 80 :

      80%

    • 90 :

      90%

    70
    MaxSpec

    string

    No

    The upper limit of the specification for automatic scale-up. You can only scale up to a higher specification within the same series of the database instance. For more details, see the specification documentation for each database instance:

    polar.mysql.x8.12xlarge

    MaxReadOnlyNodes

    integer

    No

    The maximum number of read-only nodes for the instance.

    Important You must set this parameter when the target database instance is PolarDB for MySQL Cluster Edition.

    10
    ObservationWindowSize

    string

    No

    The observation window. The parameter value consists of a number and a time unit suffix. The supported database instances and valid values are as follows. The time suffix m indicates minutes, and h indicates hours:

    • PolarDB for MySQL Cluster Edition: 5m, 10m, 15m, and 30m.

    • ApsaraDB RDS for MySQL high availability series cloud disk edition: 5m, 20m, 30m, 40m, and 1h.

    • Tair (Redis® OSS-Compatible) cloud-native (formerly cloud disk) open-source edition: 5m, 10m, 15m, and 30m.

    5m
    CoolDownTime

    string

    No

    The cool-down period. The parameter value consists of a number and a time unit suffix. The supported database instances and valid values are as follows. The time suffix m indicates minutes, h indicates hours, and d indicates days:

    • PolarDB for MySQL Cluster Edition: 5m, 10m, 30m, 1h, 2h, 3h, 1d, and 7d.

    • ApsaraDB RDS for MySQL high availability series cloud disk edition: 5m, 10m, 30m, 1h, 2h, 3h, 1d, and 7d.

    5m
    Downgrade

    boolean

    No

    Specifies whether automatic specification scale-down is enabled:

    • true: Yes.

    • false: No.

    Important You must set this parameter when the target database instance is PolarDB for MySQL Cluster Edition or ApsaraDB RDS for MySQL high availability series cloud disk edition.

    true
    Storage

    object

    No

    The configuration items for the automatic storage expansion feature.

    Apply

    boolean

    No

    Specifies whether to apply the configurations under the Storage configuration item for the automatic storage expansion feature:

    • true: Yes.

    • false: No.

    true
    Upgrade

    boolean

    No

    Specifies whether to enable automatic storage expansion:

    • true: Yes.

    • false: No.

    true
    DiskUsageUpperThreshold

    integer

    No

    The threshold of average storage space utilization that triggers automatic storage expansion. Unit: %. Valid values:

    • 50

    • 60

    • 70

    • 80

    • 90

    Valid values:

    • 50 :

      50%

    • 60 :

      60%

    • 70 :

      70%

    • 80 :

      80%

    • 90 :

      90%

    70
    MaxStorage

    integer

    No

    The upper limit of the storage space. The value must be greater than or equal to the current total storage space of the instance. Valid values:

    • ESSD cloud disk upper limit: 32,000 GB.

    • Standard SSD upper limit: 6,000 GB.

    Note

    Standard SSDs are retired. Upgrade to ESSD cloud disks.

    32000
    Bandwidth

    object

    No

    The configuration items for the bandwidth elastic scaling feature.

    Apply

    boolean

    No

    Specifies whether to apply the configurations under the Bandwidth configuration item for the bandwidth elastic scaling feature:

    • true: Yes.

    • false: No.

    true
    Upgrade

    boolean

    No

    Specifies whether to enable automatic bandwidth upgrade:

    • true: Yes.

    • false: No.

    true
    BandwidthUsageUpperThreshold

    integer

    No

    The threshold of average bandwidth usage that triggers automatic bandwidth upgrade. Unit: %. Valid values:

    • 50

    • 60

    • 70

    • 80

    • 90

    • 95

    70
    ObservationWindowSize

    string

    No

    The observation window for automatic bandwidth upgrade. The parameter value consists of a number and a time unit suffix. The time suffix m indicates minutes. Valid values:

    • 1m

    • 5m

    • 10m

    • 15m

    • 30m

    Valid values:

    • 30m :

      30 minutes.

    • 5m :

      5 minutes.

    • 15m :

      15 minutes.

    • 1m :

      1 minute.

    • 10m :

      10 minutes.

    5m
    Downgrade

    boolean

    No

    Specifies whether to enable automatic bandwidth downgrade:

    • true: Yes.

    • false: No.

    true
    BandwidthUsageLowerThreshold

    integer

    No

    The threshold of average bandwidth usage that triggers automatic bandwidth downgrade. Unit: %. Valid values:

    • 10

    • 20

    • 30

    30
    Shard

    object

    No

    The configuration items for the shard elastic scaling feature.

    Apply

    boolean

    No

    Specifies whether to apply the configurations under the Shard configuration item for the shard elastic scaling feature:

    • true: Yes.

    • false: No.

    Important The shard elastic scaling feature is supported only when the target database instance is Tair (Redis® OSS-Compatible) cloud-native (formerly cloud disk) edition in cluster architecture on the China site.

    true
    Upgrade

    boolean

    No

    Specifies whether to enable automatic shard addition:

    • true: Yes.

    • false: No.

    true
    MemUsageUpperThreshold

    integer

    No

    The threshold of average memory utilization that triggers automatic shard addition. Unit: %. Valid values:

    • 50

    • 60

    • 70

    • 80

    • 90

    Valid values:

    • 50 :

      50%

    • 60 :

      60%

    • 70 :

      70%

    • 80 :

      80%

    • 90 :

      90%

    70
    MaxShards

    integer

    No

    The maximum total number of shards for the instance. The value must be a positive integer. Valid values: 4 to 32.

    16
    UpgradeObservationWindowSize

    string

    No

    The observation window for automatic shard addition. The parameter value consists of a number and a time unit suffix. The time suffix m indicates minutes. Valid values:

    • 5m

    • 10m

    • 15m

    • 30m

    Valid values:

    • 30m :

      30 minutes.

    • 5m :

      5 minutes.

    • 15m :

      15 minutes.

    • 10m :

      10 minutes.

    5m
    Downgrade

    boolean

    No

    Specifies whether to enable automatic shard reduction:

    • true: Yes.

    • false: No.

    Note

    The automatic shard reduction feature is currently in canary release.

    true
    MemUsageLowerThreshold

    integer

    No

    The threshold of average memory utilization that triggers automatic shard reduction. Unit: %. Valid values:

    • 10

    • 20

    • 30

    Valid values:

    • 10 :

      10%

    • 20 :

      20%

    • 30 :

      30%

    30
    MinShards

    integer

    No

    The minimum total number of shards for the instance. The value must be a positive integer. Valid values: 4 to 32.

    4
    DowngradeObservationWindowSize

    string

    No

    The observation window for automatic shard reduction. The parameter value consists of a number and a time unit suffix. The time suffix h indicates hours, and d indicates days. Valid values:

    • 1h

    • 2h

    • 3h

    • 1d

    • 7d

    Valid values:

    • 1d :

      1 day.

    • 3h :

      3 hours.

    • 2h :

      2 hours.

    • 1h :

      1 hour.

    • 7d :

      7 days.

    1h
    Resource

    object

    No

    The configuration items for the resource elastic scaling feature.

    Apply

    boolean

    No

    Specifies whether to apply the configurations under the Resource configuration item for the resource elastic scaling feature:

    • true: Yes.

    • false: No.

    true
    Enable

    boolean

    No

    Specifies whether to enable resource elastic scaling:

    • true: Yes.

    • false: No.

    true
    CpuUsageUpperThreshold

    integer

    No

    The threshold of average CPU utilization that triggers automatic resource scale-up. Unit: %. Valid values:

    • 70

    • 80

    • 90

    Valid values:

    • 70 :

      70%

    • 80 :

      80%

    • 90 :

      90%

    70
    UpgradeObservationWindowSize

    string

    No

    The observation window for scale-up. The parameter value consists of a number and a time unit suffix. The time suffix m indicates minutes. Valid values:

    • 1m

    • 3m

    • 5m

    • 10m

    • 20m

    • 30m

    Valid values:

    • 30m :

      30m

    • 5m :

      5m

    • 3m :

      3m

    • 1m :

      1m

    • 10m :

      10m

    • 20m :

      20m

    5m
    DowngradeObservationWindowSize

    string

    No

    The observation window for scale-down. The parameter value consists of a number and a time unit suffix. The time suffix m indicates minutes. Valid values:

    • 1m

    • 3m

    • 5m

    • 10m

    • 20m

    • 30m

    Valid values:

    • 30m :

      30 minutes.

    • 5m :

      5 minutes.

    • 3m :

      3 minutes.

    • 1m :

      1 minute.

    • 10m :

      10 minutes.

    • 20m :

      20 minutes.

    5m

    Response elements

    Element

    Type

    Description

    Example

    object

    Code

    string

    The returned status code.

    200
    Message

    string

    The returned message.

    Note

    If the request is successful, Successful is returned. If the request fails, an error message such as an error code is returned.

    Successful
    RequestId

    string

    The request ID.

    B6D17591-B48B-4D31-9CD6-9B9796B2****
    Success

    string

    Indicates whether the request was successful:

    • true: The request was successful.

    • false: The request failed.

    true

    Examples

    Success response

    JSON format

    {
  "Code": "200",
  "Message": "Successful",
  "RequestId": "B6D17591-B48B-4D31-9CD6-9B9796B2****",
  "Success": "true"
}

    Error codes

    HTTP status code

    Error code

    Error message

    Description
    400 InvalidParams The request parameters are invalid. The request parameters are invalid.
    403 NoPermission You are not authorized to do this action. You do not have the permission to perform this operation.

    See Error Codes for a complete list.

    Release notes

    See Release Notes for a complete list.