This topic describes the read/write splitting feature of ApsaraDB RDS. This feature allows you to create read-only RDS instances, which can offload read requests from the primary RDS instance of your database system. This feature is supported only for MySQL and SQL Server.

After you enable the read/write splitting feature, your database system generates a read/write splitting endpoint or a read-only routing endpoint. The generated endpoint can distribute read requests and write requests among the primary RDS instance and read-only RDS instances in your database system. To increase the processing capability of your database system, you need only to create read-only RDS instances. You do not need to modify the configuration data on your application.