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Targeted customers: all Tablestore customers, especially customers who have the following requirements: - Peak business hours are stable and predictable. - The overall cost is expected to be predictable. - The budget system is used. Resources must be purchased in advance. Version, specification, and feature: Tablestore provides the reserved mode based on principles such as elastic dynamic scale-out, on-demand mode, and separation of storage from computing. To meet user requirements such as cost estimation and control, Tablestore releases the reserved mode in addition to the on-demand mode. The reserved mode enables you to easily estimate and control costs. Computing fees: Tablestore charges computing fees based on the unified virtual capacity unit (VCU) specification of four cores and 16 GB on a subscription basis. You must estimate computing resources in advance and then purchase computing resources. Computing resources are used to read, write, and compute data in indexes and tunnels. Storage fees: Tablestore bills actual storage usage each hour based on different instance types, including high-performance and capacity instances.