This topic describes how cold data storage is billed after you enable the cold data tiering feature.
Billing rules
After you enable cold data tiering, PolarDB for PostgreSQL lets you archive cold data from a cluster to a low-cost OSS bucket to reduce your data storage costs.
For more information about cold data tiering, see Overview of cold data tiering.
After you enable this feature and perform cold data archiving, PolarDB for PostgreSQL charges fees for the storage capacity that the cold data occupies in OSS.
The billing rules are as follows:
Regions in the Chinese mainland: CNY 0.00021 per GB per hour.
China (Hong Kong) and other regions outside the Chinese mainland: CNY 0.000294 per GB per hour.
You can purchase a storage plan to offset the OSS storage usage of your cold data and reduce storage costs. The deduction rules for storage plans are as follows:
Region type | Deduction factor | OSS storage capacity that can be offset by a 1 GB storage plan |
The Chinese mainland | 0.045 | 1/0.045=22.22 GB |
China (Hong Kong) and other regions outside the Chinese mainland | 0.045 | 1/0.045=22.22 GB |
For example, assume you purchase a 100 GB storage plan and have 50 GB of capacity remaining after offsetting other storage usage. If your cluster's cold data consumes 50 GB of OSS storage in a region in the Chinese mainland, the storage plan automatically uses 2.25 GB (50/22.22) of its capacity to offset this usage. The storage plan then has 47.75 GB of capacity remaining.
If the remaining capacity of the storage plan is insufficient to offset the OSS storage usage of cold data, the excess usage is billed on a pay-as-you-go basis.