CalculateDBInstanceWeight - ApsaraDB RDS - Alibaba Cloud Documentation Center

Queries system-assigned read weights.

Operation description

Supported database engines

MySQL
SQL Server

Feature description

When the read/write splitting feature is enabled, this operation is used to calculate system-assigned read weights. For more information about custom read weights, see DescribeDBInstanceNetInfo .

Prerequisites

Before you call this operation, make sure that the following requirements are met:

If the instance runs MySQL, the instance uses a shared proxy.
The instance runs one of the following MySQL versions and RDS editions:
- MySQL 5.7 on RDS High-availability Edition (with local disks)
- MySQL 5.6
- SQL Server on RDS Cluster Edition

Debugging

OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer.

Debug

Authorization information

There is currently no authorization information disclosed in the API.

Request parameters

Parameter	Type	Required	Description	Example
DBInstanceId	string	Yes	The primary instance ID. You can call the DescribeDBInstances operation to query the instance ID.	rm-uf6wjk5xxxxxxx

Response parameters

Parameter	Type	Description	Example
	object	The response parameters.
RequestId	string	The request ID.	C816A4BF-A6EC-4722-95F9-2055859CCFD2
Items	array<object>	An array that consists of information about the system-assigned read weight.
	object
ReadonlyInstanceSQLDelayedTime	string	The latency at which the read-only instances replicate data. The read-only instances replicate data from the primary instance at the latency that is specified by the ReadonlyInstanceSQLDelayedTime parameter. Unit: seconds.	30
Weight	string	The read weight that the system calculates in real time for the instance.	100
DBInstanceType	string	The type of the instance. Valid values: Master: primary instance Readonly: read-only instance	Master
DBInstanceId	string	The instance ID	rm-uf6wjk5xxxxxxx

Examples

Sample success responses

JSONformat

{
  "RequestId": "C816A4BF-A6EC-4722-95F9-2055859CCFD2",
  "Items": {
    "DBInstanceWeight": [
      {
        "ReadonlyInstanceSQLDelayedTime": "30",
        "Weight": "100",
        "DBInstanceType": "Master",
        "DBInstanceId": "rm-uf6wjk5xxxxxxx"
      }
    ]
  }
}

Error codes

HTTP status code	Error code	Error message	Description
403	IncorrectDBInstanceType	Current DB instance engine and type does not support operations.	The operation failed. The operation is not supported for the database engine of the RDS instance.
403	IncorrectDBInstanceConnType	Current DB instance conn type does not support this operation.	The operation is not supported for the connection type of the RDS instance.
403	IncorrectDBType	The current DB type does not support this operation.	The operation failed. The operation is not supported by the database engine of the RDS instance. Specify a different database engine.
404	InvalidDBInstanceName.NotFound	Invalid DBInstanceId NotFound.	The instance ID cannot be found.
404	IncorrectDBInstanceLockMode	Current DB instance lock mode does not support this operation.	The operation failed. The RDS instance is locked.
404	InvalidDBInstanceClass.NotFound	Specified DB instance class is not found.	The configuration or the instance type cannot be found or has been discontinued. Specify a different configuration or a different instance type.

For a list of error codes, visit the Service error codes.

Change history

Change time	Summary of changes	Operation
2022-08-12	The response structure of the API has changed	View Change Details