If you want to use the subscription storage billing method for your cluster, you must purchase a specific amount of storage capacity when you purchase the cluster.
Scenarios
The total amount of data of the PolarDB clusters in specific regions within your Alibaba Cloud account is smaller than 10 TB, and the amount of data generated by your business seldom fluctuates.
Limits
The amount of storage capacity that you purchase applies only to a single cluster. This may cause resource waste, because the cluster may consume less storage capacity than the purchased amount.
After the purchased storage capacity is exhausted, your cluster can still be used as expected. The excess storage capacity is billed on a pay-as-you-go basis. If you purchase a storage plan, excess storage usage is counted against the available account in the storage plan first. After the storage plan is exhausted, you are charged on a pay-as-you-go basis. For example, you purchase 100 GB of storage space that uses the subscription billing method and a storage plan of 50 GB, but have 200 GB of data. For the 100 GB of data that exceeds the purchased storage capacity, 50 GB is deducted from the storage plan. The remaining 50 GB is billed on a pay-as-you-go basis.
Pricing
The purchased storage capacity is deducted based on storage usage.
Storage type | Region in the Chinese mainland | Hong Kong (China) and regions outside China |
PSL5 (Hot standby storage cluster enabled) | USD 0.365 per GB-month | USD 0.403 per GB-month |
PSL5 (Hot standby storage cluster disabled) | USD 0.1825 per GB-hour | USD 0.2015 per GB-hour |
PSL4 (Hot standby storage cluster enabled) | USD 0.238 per GB-month | USD 0.263 per GB-month |
PSL4 (Hot standby storage cluster disabled) | USD 0.119 per GB-hour | USD 0.1315 per GB-hour |
Purchase subscription clusters
For information about how to use the subscription storage billing method for a cluster, see Purchase a subscription cluster.