This topic describes the fees for configuration changes to pay-as-you-go and subscription clusters.
Pay-as-you-go
Pay-as-you-go clusters are billed on an hourly basis. After you change the configuration of a pay-as-you-go cluster, the cluster is billed at the new price on an hourly basis.
Subscription
Change type | Description |
Upgrade specifications or add nodes | Payment = Total fees of the new configuration for the remaining subscription period (Monthly price of the new configuration/30/24 × Remaining subscription period measured in hours) - Total fees of the original configuration for the remaining subscription period (Monthly price of the original configuration/30/24 × Remaining subscription period measured in 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 fees of the original configuration for the remaining subscription period (Monthly price of the original configuration/30/24 × Remaining subscription period measured in hours) - Total fees of the new configuration for the remaining subscription period (Monthly price of the new configuration/30/24 × Remaining subscription period measured in hours). For example, you are charged USD 3,500 for purchasing a subscription cluster for three months. After you use coupons, you pay USD 3,000 for the cluster. After two months, the total fees of the original configuration for the remaining subscription period become USD 1,000. The total fees of the new configuration for a month are USD 800. The refund is calculated by using the following formula: USD 1,000 - USD 800 = USD 200. Note You can receive a refund for a downgraded configuration 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 will be deleted after 14 days. |
FAQ
Why is the refund that I receive less than the refund that I calculated for the downgraded configuration of the cluster?
The preceding issue may be caused by one of following scenarios:
You are offered a discount for a cluster of the original specifications before the cluster downgrade. For example, you are offered an annual discount of 15% when you purchase a cluster of the original specifications. This means that when you purchase a cluster whose original price is USD 1,000, you actually pay USD 850 for the cluster. The refund for the downgraded configuration of the cluster is calculated based on USD 850.
You use a voucher for a cluster of the original specifications before the cluster downgrade. For example, you use a voucher when you purchase a cluster of the original specifications. In this case, you actually pay USD 500 for the cluster. The refund for the downgraded configuration of the cluster is calculated based on USD 500.
References
Manual configuration change
You can manually change the specifications of a cluster based on your business requirements. For more information, see Manually upgrade or downgrade a PolarDB cluster and Add or remove read-only nodes.
Automatic configuration change
PolarDB for MySQL supports the auto scaling feature of DAS. For more information about the feature, see Autonomy center. You can customize the conditions for triggering auto scaling based on the peak, valley, and frequency of business fluctuations. If the conditions are met, PolarDB for MySQL automatically upgrades or downgrades cluster specifications.