When you change the configurations of a cluster, the system calculates the related fees based on the billing method of the cluster and the configuration changes.
Subscription
Configuration change | Payment or refund |
Upgrade specifications or add nodes | Payment = Total fee of the new configuration for the remaining subscription period (Monthly price of the new configuration/30/24 × Unused hours) - Total fee of the original configuration for the remaining subscription period (Monthly price of the original configuration/30/24 × Unused hours). For example, the monthly price of the new configuration is USD 14,400, the monthly price of the original configuration is USD 7,200, and the remaining subscription period is 50 days. The payment is calculated by using the following formula: (USD 14,400/30/24 × 50 × 24) - (USD 7,200/30/24 × 50 × 24) = USD 12,000. |
Downgrade specifications or delete nodes | Refund = Total fee of the original configuration for the remaining subscription period (Monthly price of the original configuration/30/24 × Unused hours) - Total fee of the new configuration for the remaining subscription period (Monthly price of the new configuration/30/24 × Unused hours). For example, the monthly price of the old configuration is USD 1,000, the monthly price of the new configuration is USD 800, and the remaining subscription period is 30 days. The refund is calculated by using the following formula: (USD 1000/30/24 × 30 × 24)-(800/30/24 × 30 × 24) = USD 200. Note You can receive a refund for a downgraded specification of a subscription cluster. However, fees for the entire cluster cannot be refunded. If you want to apply for a refund for the entire cluster, submit a ticket. If your application is approved, your subscription cluster is frozen and is deleted after 14 days. |
Pay-as-you-go
You are charged for pay-as-you-go clusters by hour. After you change the configurations of a pay-as-you-go cluster, you are charged for the cluster on an hourly basis based on the price of the new configurations.
Serverless
You cannot manually change the configurations of a serverless cluster. The compute node resources of a serverless cluster are dynamically adjusted based on changes in system workloads.
You can adjust the scaling policy for cluster resources by modifying the serverless settings. For more information, see Set a scaling policy for serverless cluster resources.
FAQ
Why is the refund that I received less than the refund that I calculated for the downgraded specifications of my cluster?
References
Manually change the cluster specifications
You can manually change the cluster specifications to meet your business requirements. For more information, see Manually change the specifications of a cluster and Add or remove read-only nodes.
Automatically change the cluster specifications
PolarDB for MySQL provides multiple automatic specifications change (auto scaling) methods. You can configure relevant scaling parameters to enable elastic scaling of cluster specifications. For more information, see Automatically change the specifications of a cluster.
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