Billable items - PolarDB for MySQL - Alibaba Cloud Documentation Center

This topic describes the billable items of PolarDB.

The following chart shows the approximate proportion of each billable item in a PolarDB cluster.

Table 1. Billable items
Billable item	Description	Billing method
Compute node	Compute nodes contain primary and read-only nodes. You are charged for compute nodes based on their region, specifications, and usage duration.	Pay-as-you-go Subscription Note For more information about how to purchase compute nodes, see Overview. For more information about the specifications and pricing of compute nodes, see Specifications of compute nodes and Pricing of compute nodes.
Storage space	Storage space is used to store cluster data files, index files, log files, and temporary files. Log files include online and archived logs. You are charged for the amount of storage space that you use. The amount you are charged depends on the volume of data stored and the length of time for which data is retained.	Pay-as-you-go and storage plan Pay-as-you-go Note The subscription billing method is not supported for storage space. If you select Subscription when you purchase a cluster, the subscription billing method is applied only to compute nodes. Subscription clusters may incur additional fees on top of their subscription, such as those generated by storage space. We recommend that you purchase storage plans, which are cost-effective.
Backup storage space (charged only after it exceeds the free quota)	Backup files consume storage space. PolarDB offers a free storage quota for backup files. After this quota is consumed, you are charged for the amount of additional storage space consumed by backup files. The amount you are charged depends on the size of data backup files and the length of time for which the files are retained.	Pay-as-you-go and storage plan Pay-as-you-go 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. Subscription clusters may incur additional fees on top of their subscription, such as those generated by storage space. We recommend that you purchase storage plans to offset fees generated by level-1 backup.
SQL Explorer (optional)	The SQL Explorer feature provides value-added capabilities, such as security auditing and performance diagnostics. After you enable this feature, you are charged for the amount of storage space consumed by audit logs. The amount you are charged depends on the size of audit logs and the length of time for which the logs are retained.	Pay-as-you-go Note The SQL Explorer feature does not support the subscription billing method. If you select Subscription when you purchase a cluster, the subscription billing method is applied only to compute nodes. Subscription clusters may incur additional fees on top of their subscription, such as those generated by the SQL Explorer feature.

Note

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.
At present, you can use the PolarProxy feature free of charge. PolarProxy will be upgraded to PolarProxy Enterprise Edition, which serves enterprises with better capabilities. For more information, see Overview.
The multi-zone deployment feature is provided free of charge. For more information, see Multi-zone deployment.