我正在尝试将数据从s3加载到amazon RDS数据库，下面是我用来加载数据的代码：
aws rds restore-db-instance-from-s3 ^
--allocated-storage 250 ^
--db-instance-identifier myidentifier ^
--db-instance-class db.m4.large ^
--engine mysql ^
--master-user-name masterawsuser ^
--master-user-password masteruserpassword ^
--s3-bucket-name mybucket ^
--s3-ingestion-role-arn arn:aws:iam::account-number:role/rolename ^
--s3-prefix bucketprefix ^
--source-engine mysql ^
--source-engine-version 5.6.27
但我收到以下错误：
An error occurred (DBInstanceAlreadyExists) when calling the RestoreDBInstanceFromS3 operation: DB Instance already exists
如何解决此问题？
由于