如何通过RDS的API新增一个数据库（还原备份文件方式，而不是新增空库）

因为我们是SAAS应用，新增一个客户会自动新增一个有数据的初始库。请问如何通过API来做？

我根据API提供来做
String resp = CreateRequest().Execute("CreateImportDataUpload",
                                                  new Dictionary<String, String>()
                                                  {
                                                      { "DBInstanceId", "xxxxxxxxxxxx" },
                                                      { "DBName", "db1" }
                                                  });

返回值说不支持此操作：<?xml version="1.0" encoding="utf-8"?>
<Error>
<RequestId>EF9C2767-9FE3-4F60-B6BA-95103ABF8E10</RequestId>
<HostId>rds.aliyuncs.com</HostId>
<Code>IncorrectDBInstanceEngine</Code>
<Message>The DBInstance of the current engine does not support this operation.</Message>
</Error>

请官方人员解释一下！！！！！