Supported database engines
- SQL Server
Note The host specifications that can be upgraded vary based on the database engines. For more information, see the following topics:
- Host specifications cannot be downgraded.
- The Upgrade option is unavailable and you cannot upgrade host specifications in the following
- 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 and specifications 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.
- If you upgrade the specifications of a host, the host restarts. Then, the instances
that are running on the host restart.
- When the host is restarting, 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.
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 new specifications/30/24 x Unused hours.