Help Center/ Document Database Service/ API Reference/ APIs V3.0 (Recommended)/ DB Instance Management/ Migrating a DB Instance to Another AZ
Updated on 2025-10-24 GMT+08:00
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Migrating a DB Instance to Another AZ

API Description

This API is used to migrate a DB instance to another AZ.

Service will be interrupted for up to 60 seconds while the AZ is being changed. The time required to change an AZ depends on the amount of data to be migrated. The entire migration process may take an hour. You are advised to use the HA connection to access the instance or configure your client to automatically reconnect to the instance.

Constraints

  • DDS Community Edition clusters and replica sets support this operation.
  • Cross-AZ instances do not support this operation.
  • DB instances created using an IPv6 subnet do not support this operation.
  • Read replicas or inactive standby nodes in a replica set instance do not support this operation.
  • If a cluster instance has read replicas associated, the instance cannot be migrated to another AZ.

URI

  • URI format

    POST /v3/{project_id}/instances/{instance_id}/migrate

  • URI example

    https://dds.ap-southeast-1.myhuaweicloud.com/v3/0549b4a43100d4f32f51c01c2fe4acdb/instances/9136fd2a9fcd405ea4674276ce36dae8in02/migrate

Table 1 Path parameters

Name

Mandatory

Type

IN

Description

project_id

Yes

string

path

Explanation:

Project ID of a tenant in a region. To obtain the project ID, see Obtaining a Project ID.

Constraints:

N/A

Value range:

N/A

Default value:

N/A

instance_id

Yes

string

path

Explanation:

Instance ID, which can be obtained by calling the API described in Querying Instances and Details. If you do not have an instance, call the API described in Creating a DB Instance to create one.

Constraints:

N/A

Value range:

N/A

Default value:

N/A

Request Parameters

Table 2 Request header parameters

Name

Mandatory

Type

IN

Description

X-Auth-Token

Yes

string

header

Definition

User token obtained from IAM. For details, see Authentication.

Constraints

N/A

Range

N/A

Default Value

N/A
Table 3 Parameter description

Name

Type

Mandatory

Description

target_azs

String

Yes

Definition

Single-AZ or multi-AZ to which the VM is migrated.

Constraints

N/A

Range

The value is obtained from the code field in the response body of the API in Querying AZs to Which an Instance Can Be Migrated.

Default Value

N/A

Example Requests

  • Migrating a DB instance from one AZ to another AZ 
    { 
        "target_azs":"az1xahz"
}
  • Migrating a DB instance from a single AZ to multiple AZs 
    {
	"target_azs":"az1xahz,az2xahz,az3xahz"
}

Response Parameters

  • Parameter description
    Table 4 Parameter description

    Name

    Type

    Mandatory

    Description

    job_id

    String

    Yes

    Definition

    The task ID.

    Range

    N/A
  • Example Responses 
    { 
    "job_id": "3711e2ad-5787-49bc-a47f-3f0b066af9f5" 
}

Status Code

For more information, see Status Code.

Error Code

For more information, see Error Code.

Parent topic: DB Instance Management