Configuring an Autoscaling Policy

Function

This API is used to configure autoscaling for a DB instance. You will be billed for the added storage.

If available storage drops to a specified threshold or 10 GB, your storage will autoscale by 15% (in increments of 10 GB) of your allocated storage.

Autoscaling up the storage of a read replica does not affect that of the primary instance. The new storage space of the read replica after autoscaling must be no less than that of the primary instance.

• Before calling an API, you need to understand the API in Authentication.
• Before calling this API, obtain the required region and endpoint.

Constraints

• This API is only available to RDS for MySQL, Microsoft SQL Server and RDS for PostgreSQL instances whose storage type is cloud SSDs or extreme SSDs and storage space is at least 40 GB.
• Storage autoscaling is unavailable when the instance is in any of the following statuses: changing instance class, upgrading a minor version, migrating the standby instance, and rebooting.
• The storage space can be autoscaled up only when your instance status is Available or Storage full. The maximum allowed storage is 4,000 GB.

URI

• URI format

  PUT /v3/{project_id}/instances/{instance_id}/disk-auto-expansion

• Parameter description

  Table 1 Parameters

  Parameter	Mandatory	Description
  project_id	Yes	Project ID of a tenant in a region. For details about how to obtain the project ID, see Obtaining a Project ID.
  instance_id	Yes	Instance ID.

Request

• Parameter description

  Table 2 Parameters

  Parameter	Mandatory	Type	Description
  switch_option	Yes	Boolean	Whether to enable autoscaling. true: indicates that autoscaling will be enabled. false: indicates that autoscaling will be disabled.
  limit_size	No	Integer	Upper limit for autoscaling, in GB. This parameter is mandatory when switch_option is set to true. The value ranges from 40 GB to 4,000 GB and must be no less than the current storage of the instance.
  trigger_threshold	No	Integer	Threshold to trigger autoscaling. If the available storage drops to this threshold or 10 GB, autoscaling is triggered. This parameter is mandatory when switch_option is set to true. Enumerated values: 10 15 20

• URI example

  PUT https://rds.eu-de.otc.t-systems.com/v3/054e292c9880d4992f02c0196d3ea468/instances/3d39c18788b54a919bab633874c159dfin01/disk-auto-expansion

• Request example

  {
    "switch_option" : true,
    "limit_size" : 4000,
    "trigger_threshold" : 10
  }

Response

• Example normal response

  None

• Abnormal Response

  For details, see Abnormal Request Results.

Status Code

• Normal

  200

• Abnormal

  For details, see Status Codes.

Error Code

For details, see Error Codes.