After you add a host to an ApsaraDB MyBase dedicated cluster, you can change the host specifications if the host performance cannot meet your business requirements.

Supported database engines

  • MySQL
  • SQL Server
  • PostgreSQL

Note

  • Host specifications cannot be downgraded.
  • If one of the following situations happens, you cannot upgrade the host specifications. The Upgrade button is dimmed.
    • An instance is being created on the host.
    • An instance that runs on the host is being migrated.
    • The host is locked because it expires.
  • The host specification before the upgrade and the host specification after the upgrade must correspond to the same host type. For more information about host specifications, see Instance types of hosts.
  • When you upgrade host specifications, you must increase both the CPU cores and the memory. You cannot increase only the CPU cores or the memory.
  • The minimum interval at which you upgrade the specifications of the same host is 10 minutes.
  • After you upgrade host specifications, the host and the instances that run on the host are restarted.
    Note
    • When the host is being restarted, the primary instance that runs on the host becomes a secondary instance. This may cause one or two transient connections.
    • The time that is required to restart the host varies based on the duration of the primary/secondary switchover.

Pricing

The following formulas are used to calculate the fees for upgrading host specifications:

Upgrade fees = Total fees of the new specifications for the remaining subscription period - Total fees of the original specifications for the remaining subscription period. Total fees of the new specifications for the remaining subscription period = Monthly fees of the new specifications/30/24 x Unused hours. Total fees of the original specifications for the remaining subscription period = Monthly fees of the original specifications/30/24 x Unused hours.

For example, the monthly charges of the new specifications are USD 14,400, the monthly charges of the original specifications are USD 7,200, and the host is to expire 50 days later. In this case, the following equation is used to calculate the upgrade fees: (14400/30/24 x 50 x 24) - (7200/30/24 x 50 x 24) = 12000.