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Help Center> Relational Database Service> User Guide> Working with RDS for SQL Server> Instance Modifications> Manually Switching Between Primary and Standby DB Instances
Updated at: Apr 02, 2022 GMT+08:00

Manually Switching Between Primary and Standby DB Instances


If you choose to create primary/standby DB instances, RDS will create a primary DB instance and a synchronous standby DB instance in the same region. You can access the primary DB instance only. The standby instance serves as a backup. You can manually promote the standby DB instance to the new primary instance for failover support.


  • A DB instance is running properly.
  • The replication between the primary and standby instances is normal.


  1. Log in to the management console.
  2. Click in the upper left corner and select a region and a project.
  3. Click in the upper left corner of the page and choose Database > Relational Database Service. The RDS console is displayed.
  4. On the Instance Management page, click the target primary/standby DB instance.
  5. In the DB Information area on the displayed Basic Information page, click Switch in the DB Instance Type field.

    Alternatively, click in the DB instance topology on the Basic Information page to perform a primary/standby switchover.

    A primary/standby switchover may cause service interruptions for several seconds or minutes (depending on the replication delay). To prevent traffic congestion, you are advised to perform a switchover during off-peak hours.

  6. If you have enabled operation protection, click Send Code in the displayed Identity Verification dialog box and enter the obtained verification code. Then, click OK.

    Two-factor authentication improves the security of your account and cloud product. For details about how to enable operation protection, see the Identity and Access Management User Guide.

  7. In the Switch Primary/Standby Instances dialog box, click Yes to switch between the primary and standby DB instances.

    If the replication status is Available and the replication delay is greater than 300s, the primary/standby switchover task cannot be delivered.

  8. After the switchover is successful, check the status of the DB instance on the Instance Management page.

    • During the switchover, the DB instance status is Switchover in progress.
    • In the upper right corner of the DB instance list, click to refresh the list. After the switchover is successful, the DB instance status will become Available.

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