Restoring a DB Instance from Backups

Scenarios

Function Description

Constraints

• Constraints on restoring data to an existing DB instance (other than the original instance):
  • If the target existing DB instance has been deleted, data cannot be restored to it.
  • Restoring to an existing DB instance will overwrite data on it and cause the existing DB instance to be unavailable during the restoration.
  • To restore backup data to an existing DB instance, the selected DB instance must be in the same VPC as the original DB instance and must have the same DB engine and DB engine version as the original DB instance. For example, a backup of PostgreSQL 16.5 can be restored only to an existing instance running PostgreSQL 16.5 instead of 16.6.
  • Ensure that the storage space of the selected instance is no less than that of the original instance. Otherwise, data will not be restored.

Procedure

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.
4. On the Backups page, select the backup to be restored and click Restore in the Operation column.

   Alternatively, click the target DB instance on the Instances page. On the displayed page, choose Backups & Restorations. On the displayed page, select the backup to be restored and click Restore in the Operation column.

5. Select a restoration method.
   • Create New Instance

     The Create New Instance page is displayed.

     • The DB engine and engine version of the new instance are the same as those of the original instance.
     • The new instance must have at least the same storage space as the original instance.
     • For other parameter settings, refer to Buying an RDS for PostgreSQL Instance.

   • Restore to Existing
     1. Select the prompt message.
     2. Select an existing instance and click Next.
     3. Confirm the information and click OK.

6. View the restoration result. The result depends on which restoration method was selected:
   • Create New Instance

     A new DB instance is created using the backup data. The status of the DB instance changes from Creating to Available.

     The new DB instance is independent of the original one. If you need read replicas to offload read pressure, create one or more for the new DB instance.

     After the new instance is created, a full backup will be automatically triggered.

   • Restore to Existing

     On the Instances page, the status of the instance changes from Restoring to Available. If the target existing DB instance contains read replicas, the read replica status is the same as the target existing DB instance status.

     After the restoration is complete, a full backup will be automatically triggered.