This topic describes the billable items of PolarDB.
The following chart shows the approximate proportion of each billable item in a PolarDB cluster.
|Billable item||Description||Billing method|
|Backup storage space (only charged after the free quota is reached)|
Note The subscription billing method is not supported for backup storage space. If you select Subscription when you purchase a cluster, the subscription billing method is applied only to compute nodes, and you may still be charged for other items, such as the storage of backup files. We recommend that you purchase storage plans to offset fees generated by level-1 backup. For more information, see Billing rules of backup storage that exceeds the free quota.
|PolarProxy (serverless)||PolarProxy is billed on an hourly basis in PCUs. The bill of PolarProxy depends on the region where the serverless cluster is deployed and the duration.||Serverless|
|SQL Explorer (optional)|
- The global database network (GDN) feature is provided free of charge. You are charged only for each PolarDB cluster that uses the GDN feature. For more information, see GDN.
- The multi-zone deployment feature is provided free of charge. For more information, see Multi-zone deployment.