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RDS for MySQL

RDS for MySQL

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    • RDS for MySQLAPI referenceV2（2022-01-01）Managing parametersDescribeDBNodeParameterDifferences
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Managing parameters
DescribeDBNodeParameterDifferences
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DescribeDBNodeParameterDifferences

Call the DescribeDBNodeParameterDifferences API to query the parameter differences between nodes of an instance.

Request type

Synchronous request.

Request parameters

Name
Type
Required
Example
Description
InstanceId
String
Yes
mysql-25651c34****
Instance ID.

Response parameters

Name
Type
Example
Description
NodeDifferentParameters
Object[]
Refer to the response example.
List of node parameter differences.
ParameterName
String
bulk_insert_buffer_size
Parameter name.
NodeParameterValueDetails
Object[]
Please refer to the response example.
Details of the node difference parameters.
Expression
String
ibtmp1:50M:autoextend:max:30G
Parameter expression.
NodeId
String
mysql-25651c34****-md1b4-0
Node ID.
NodeSpec
String
rds.mysql.d1.n.1c1g
Node specification.
NodeType
String
Primary
The master node needs to pass in Primaryfor NodeType, while the read-only node does not need to pass it in.
ParameterValue
String
4194305
Runtime value of the parameter.
ZoneId
String
cn-beijing-a
Availability zone ID.

Sample request 

POST /?Action=DescribeDBNodeParameterDifferences&Version=2022-01-01 HTTP/1.1
Content-Type: application/json
Host: rds-mysql.cn-beijing.volcengineapi.com
X-Date: 20211202T101010Z
Authorization: HMAC-SHA256 Credential=AKLTN2I0MmFiNzMxNWE5NDgzMzk4MmVjMTVkODlkZTZ****/20211202/cn-beijing/rds_mysql/request,SignedHeaders=x-date, Signature=71d31fc7bcf990142851c9833c5656391486cda0ae2e0b8ada733b7c6458****
{
    "InstanceId": "mysql-25651c34****"
}

Sample response 

{
    "ResponseMetadata": {
        "RequestId": "20250605204036314B7292FA47816D6B56-561288",
        "Action": "DescribeDBNodeParameterDifferences",
        "Version": "2022-01-01",
        "Service": "rds_mysql",
        "Region": "cn-beijing2"
    },
    "Result": {
        "NodeDifferentParameters": [
            {
                "NodeParameterValueDetails": [
                    {
                        "Expression": "",
                        "NodeId": "mysql-25651c34****-md1b4-0",
                        "NodeSpec": "rds.mysql.d1.n.1c1g",
                        "NodeType": "Primary",
                        "ParameterValue": "4194304",
                        "ZoneId": "cn-beijing-a"
                    },
                    {
                        "Expression": "",
                        "NodeId": "mysql-25651c34****-r399d",
                        "NodeSpec": "rds.mysql.d1.n.1c1g",
                        "NodeType": "ReadOnly",
                        "ParameterValue": "4194305",
                        "ZoneId": "cn-beijing-a"
                    }
                ],
                "ParameterName": "bulk_insert_buffer_size"
            }
        ]
    }
}

Error codes

For more details, refer to Error codes.

Last updated: 2025.08.25 16:17:36