This topic describes the pricing of serverless ApsaraDB RDS for SQL Server instances.
Billing rules
The fee for a serverless RDS instance consists of the fees for RDS Capacity Units (RCUs) and fees for storage resources. The billable RCU size ranges from 2 to 8. The system separately issues bills for the RCUs and storage resources that are used by a serverless RDS instance on an hourly basis.
You are charged for the total storage capacity that you select when you create a serverless RDS instance even if your actual storage usage is less than or equal to the selected total storage capacity.
If your actual storage usage is greater than the selected total storage capacity of the serverless RDS instance, you can manually expand the storage capacity of the serverless RDS instance, and you are charged based on the actual usage. After the storage capacity of the instance is expanded, you cannot reduce the storage capacity. For more information, see Expand the storage capacity of a serverless ApsaraDB RDS for SQL Server instance.
Unit prices
Billable item | Unit price |
RCU |
|
Storage capacity | ESSD PL1: USD 0.0008 per GB-hour |
Formula
Serverless RDS instance fees = RCU fees + Storage resource fees
Billing examples
You purchased a serverless RDS instance that has a storage capacity of 200 GB and an RCU range of 2 to 8 in the Singapore region. Assume that during the course of a day, you experience a 1-hour peak in which 8 RCUs are consumed, while 2 RCUs are consumed per hour in the other 23 hours. The unit price of an RCU is USD 0.288 per RCU-hour, and the unit price of storage is USD 0.0008 per GB-hour. The fees for the serverless RDS instance in the day are calculated by using the following formulas:
RCU fees: (0.288 × 1 × 8)+(0.288 × 23 × 2) = USD 15.552
Storage resource fees = 0.0008 × 24 × 200 = USD 3.84
Serverless RDS instance fees = USD 15.552 + USD 3.84 = USD 19.392
The prices used in the example are for reference only.
Fees for a serverless RDS instance in different states
Instance state | RCU fee | Storage resource fee |
Suspending | Charged | Charged |
Suspended | Not charged | Charged |
Starting | Not charged | Charged |
Running | Charged | Charged |