This topic describes the read/write splitting function of ApsaraDB for RDS. This function is supported only for MySQL and SQL Server. It allows you to create read-only instances that are used offload read requests from the primary instance. Your database system automatically forwards read and write requests to the primary and read-only instances based on the specified read weights.

After you enable read/write splitting, your database system generates a read/write splitting endpoint or read-only endpoint. This endpoint is used to implement read/write splitting. You can increase the processing capability of your database system by creating read-only instances. This relieves you from the need to modify the configuration data on your application.