Updated on 2026-01-05 GMT+08:00

Querying an Auto Scaling Policy

Function

This API is used to query an auto scaling policy. Before calling this API:

Calling Method

For details, see Calling APIs.

Authorization Information

Each account has all the permissions required to call all APIs, but IAM users must be assigned the required permissions.

  • If you are using role/policy-based authorization, see Permissions and Supported Actions for details on the required permissions.
  • If you are using identity policy-based authorization, the following identity policy-based permissions are required.

    Action

    Access Level

    Resource Type (*: required)

    Condition Key

    Alias

    Dependency

    gaussdbformysql:autoscaling:listPolicy

    Read

    instance *

    • g:EnterpriseProjectId

    • g:ResourceTag/<tag-key>

    gaussdb:autoscaling:list

    -

URI

GET /v3/{project_id}/instances/{instance_id}/auto-scaling/policy

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

Content-Type

Yes

String

Definition

Content type.

Constraints

N/A

Range

application/json

Default Value

N/A

X-Language

No

String

Definition

Request language type.

Constraints

N/A

Range

  • en-us
  • zh-cn

Default Value

en-us

Response Parameters

Status code: 200

Table 3 Response body parameters

Parameter

Type

Description

id

String

Definition

ID of an auto scaling policy.

Range

N/A

instance_id

String

Definition

Instance ID.

Range

The value contains 36 characters with a suffix of in07. Only letters and digits are allowed.

instance_name

String

Definition

Instance name.

Range

The name must start with a letter and consist of 4 to 64 characters. Only letters (case-sensitive), digits, hyphens (-), and underscores (_) are allowed.

status

String

Definition

Whether auto scaling is enabled.

Range

  • ON: enabled
  • OFF: disabled

monitor_cycle

Integer

Definition

Observation period, in seconds. During the entire observation period, if the average CPU usage is greater than or equal to the preset value, a scale-up is triggered.

Range

  • 300
  • 600
  • 900
  • 1800

silence_cycle

Integer

Definition

Silent period, in seconds. It indicates the minimum interval between two auto scale-up operations or two auto scale-down operations.

Range

  • 300
  • 600
  • 1800
  • 3600
  • 7200
  • 10800
  • 86400
  • 604800

enlarge_threshold

Integer

Definition

Average CPU usage.

Range

50-100

max_flavor

String

Definition

Maximum specifications.

Range

Maximum specifications that can be changed for an instance at the current site.

reduce_enabled

Boolean

Definition

Whether auto scale-down is enabled.

Range

  • true: enabled
  • false: disabled

min_flavor

String

Definition

Minimum specifications.

Range

Minimum specifications that can be changed for an instance at the current site.

silence_start_at

String

Definition

Start time of the silent period (end time of the last change).

The format is yyyy-mm-ddThh:mm:ssZ. T is the separator between the calendar and the hourly notation of time. Z indicates the time zone offset. For example, in the Beijing time zone, the offset is +0800.

Range

N/A

scaling_strategy

ScalingStrategyInfo object

Definition

Auto scaling policy.

max_read_only_count

Integer

Definition

Maximum number of read replicas.

Range

2 ≤ Number of current read replicas < Preset value ≤ 15

min_read_only_count

Integer

Definition

Minimum number of read replicas.

Range

1–14

read_only_weight

Integer

Definition

Read weights of read replicas.

Range

0–1000

Table 4 ScalingStrategyInfo

Parameter

Type

Description

flavor_switch

String

Definition

Whether instance specifications can be automatically scaled up or down.

Range

  • ON: Yes
  • OFF: No

read_only_switch

String

Definition

Whether the function for adding or deleting read replicas is enabled.

Range

  • ON: Yes
  • OFF: No

Status code: 400

Table 5 Response body parameters

Parameter

Type

Description

error_code

String

Error code.

error_msg

String

Error message.

Status code: 500

Table 6 Response body parameters

Parameter

Type

Description

error_code

String

Error code.

error_msg

String

Error message.

Example Request

Querying an auto scaling policy

GET https://{endpoint}/v3/97b026aa9cc4417888c14c84a1ad9860/instances/61a4ea66210545909d74a05c27a7179ein07/auto-scaling/policy

Example Response

Status code: 200

Success.

  • Performing a query after auto scaling is enabled
    {
      "id" : "26d8e193-1ea0-4adb-89d0-d1343399d0e7",
      "instance_id" : "41ff7519e22d44eea6066615fa5b17c7in07",
      "instance_name" : "gauss-test-1",
      "status" : "ON",
      "monitor_cycle" : 300,
      "silence_cycle" : 300,
      "enlarge_threshold" : 50,
      "max_flavor" : "gaussdb.mysql.large.x86.4",
      "reduce_enabled" : false,
      "min_flavor" : "gaussdb.mysql.medium.x86.4",
      "silence_start_at" : "2023-08-31T08:59:09+0000",
      "scaling_strategy" : {
        "flavor_switch" : "ON",
        "read_only_switch" : "ON"
      },
      "max_read_only_count" : 2,
      "min_read_only_count" : 1,
      "read_only_weight" : 10
    }
  • Performing a query after auto scaling is disabled
    {
      "id" : null,
      "instance_id" : "41ff7519e22d44eea6066615fa5b17c7in07",
      "instance_name" : "gauss-test-1",
      "status" : "OFF",
      "monitor_cycle" : null,
      "silence_cycle" : null,
      "enlarge_threshold" : null,
      "max_flavor" : null,
      "reduce_enabled" : null,
      "min_flavor" : null,
      "silence_start_at" : "",
      "scaling_strategy" : {
        "flavor_switch" : "",
        "read_only_switch" : ""
      },
      "max_read_only_count" : null,
      "min_read_only_count" : null,
      "read_only_weight" : null
    }

SDK Sample Code

The SDK sample code is as follows.

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package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.gaussdb.v3.region.GaussDBRegion;
import com.huaweicloud.sdk.gaussdb.v3.*;
import com.huaweicloud.sdk.gaussdb.v3.model.*;


public class ShowAutoScalingPolicySolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        GaussDBClient client = GaussDBClient.newBuilder()
                .withCredential(auth)
                .withRegion(GaussDBRegion.valueOf("<YOUR REGION>"))
                .build();
        ShowAutoScalingPolicyRequest request = new ShowAutoScalingPolicyRequest();
        request.withInstanceId("{instance_id}");
        try {
            ShowAutoScalingPolicyResponse response = client.showAutoScalingPolicy(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}
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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkgaussdb.v3.region.gaussdb_region import GaussDBRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkgaussdb.v3 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = GaussDBClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(GaussDBRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = ShowAutoScalingPolicyRequest()
        request.instance_id = "{instance_id}"
        response = client.show_auto_scaling_policy(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)
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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    gaussdb "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/gaussdb/v3"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/gaussdb/v3/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/gaussdb/v3/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        Build()

    client := gaussdb.NewGaussDBClient(
        gaussdb.GaussDBClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.ShowAutoScalingPolicyRequest{}
	request.InstanceId = "{instance_id}"
	response, err := client.ShowAutoScalingPolicy(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.

Status Code

For details, see Status Codes.

Error Code

For details, see Error Codes.