Tair allows you to upgrade or downgrade an instance based on your business requirements to optimize resource usage and cost performance.

Change process and impacts

For more information about the process, impacts, and operation methods of a configuration change, see Change the configurations of an instance.

Pay-as-you-go instances

A pay-as-you-go instance is billed based on the configurations that are used when a billing order is generated.

Subscription instances

You can change the configurations of a subscription instance before or after the instance expires. You can upgrade or downgrade an instance. Higher specifications are charged more than lower specifications. For example, the price of an 8 GB read/write splitting instance with five read replicas is higher than that of a 16 GB cluster instance. If you want to change a 16 GB cluster instance to an 8 GB read/write splitting instance with five read replicas, you must upgrade the instance.

Note You cannot change the configurations if an unpaid renewal order exists in your account.
Action Description
Upgrade Total fees for a specification upgrade = (Daily fees of the instance after the upgrade - Daily fees of the instance before the upgrade) × (Number of days between the date when the subscription expires and the upgrade date)
Downgrade Downgrade refunds = (Daily fees of the instance before the downgrade - Daily fees of the instance after the downgrade) × (Number of days between the date when the subscription expires and the downgrade date)

If the number of remaining days before service expiration is less than 365, you are charged based on the monthly subscription price. If the number of remaining days is greater than or equal to 365, you are charged based on the annual subscription price.

Change Tair instances between series

You cannot change instances between Tair DRAM-based series and hybrid-storage series.