Help Center/ Relational Database Service_RDS for SQL Server/ FAQs/ Capacity Expansion and Specification Change/ Are My RDS for SQL Server Instances Still Available During Storage Scale-up or Instance Class Change?
Updated on 2025-06-30 GMT+08:00

Are My RDS for SQL Server Instances Still Available During Storage Scale-up or Instance Class Change?

Currently, you can scale up storage space or change the vCPUs and memory of RDS for SQL Server instances.

  • When storage space is being scaled up, RDS for SQL Server instances are still available and services are not affected. However, you cannot delete or reboot DB instances that are being scaled.
  • After you change the instance class of a DB instance, the DB instance will be rebooted and the cache in the memory will be automatically cleared. To prevent service interruption, perform the operation during off-peak hours. Changing an instance class during peak hours will take much more time.

    When you change the instance class of a primary/standby instance, service downtime only occurs during the primary/standby switchover. The duration of the downtime varies from seconds to minutes based on the replication delay and the number of temporary files. Perform the operation during off-peak hours.