This topic describes how to purchase a storage plan.
Coverage
You are eligible for storage plans when you use the following resources:
- Cluster storage
The storage of each PolarDB cluster is charged based on the data volume and retention period. If you require a larger storage capacity, such as 1,000 GB or more, we recommend that you use storage plans to reduce costs.
- Level-1 backups that exceed the free quota
Storage plans are applied to all PolarDB clusters that belong to your account. The remaining capacity of a storage plan is automatically applied to the overage of level-1 backups at a ratio of 1:1.6 when the free quota is exhausted. In this case, every 1 GB of the storage plan is used to offset 1.6 GB of level-1 backup storage. If the remaining capacity of the storage plan is insufficient to offset the level-1 backup storage space, you are charged for additional storage space on a pay-as-you-go basis. For more information, see Storage plans.
Precautions
- Storage plans can be used by all PolarDB clusters in the regions that are specified by the Plan Type parameter. You can select Mainland China or Outside Mainland China.
- If the capacity of your storage plan is insufficient, you can . However, storage plans cannot be downgraded.Upgrade a storage plan
- If the amount of the storage that is used exceeds the capacity of your storage plan,
you are charged for the additional storage resources based on the pay-as-you-go billing
method.
For example, you have created three PolarDB clusters and each cluster requires 400 GB of storage. If you purchase a storage plan of 1,000 GB and these clusters share the storage plan, the storage resources used in excess of 200 GB are billed on a pay-as-you-go basis. For more information, see View the database storage usage.