Restoring a DB Instance from a Backup

Scenarios

This section describes how to use an automated or manual backup to restore a DB instance to the status when the backup was created. The restoration is at the DB instance level.

When you restore a DB instance from a backup file, a full backup file is downloaded from OBS and then restored to the DB instance at an average speed of 40 MB/s.

Procedure

1. Log in to the management console.
2. Click in the upper left corner of the page and choose Databases > Relational Database Service.
3. 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.

4. Select a restoration method.

   • Create New Instance

     Click OK. The Create New Instance page is displayed.

     • The DB engine and version of the new DB instance are the same as those of the original DB instance and cannot be changed.
     • Storage space of the new DB instance is the same as that of the original DB instance by default and the new instance must be at least as large as the original DB instance.
   • Restore to Original
     1. Select "I acknowledge that after I select Restore to Original, data on the original databases will be overwritten and the original DB instance will be unavailable during the restoration." and click Next.
     2. Confirm the information and click OK.
     

     • If the DB instance for which the backup is created has been deleted, data cannot be restored to the original DB instance.
     • Restoring to the original DB instance will overwrite all existing data and the DB instance will be unavailable during the restoration process.
   • Restore to Existing
     1. Select "I acknowledge that restoring to an existing DB instance will overwrite data on the instance and will cause the existing DB instance to be unavailable during the restoration. Only DB instances that can be used as target instances for the restoration are displayed here. Eligible instances must have the same DB engine type, version, and at least as much storage as the instance being restored." and click Next.
     2. Confirm the information and click OK.
     

     • 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.
     • To restore backup data to an existing DB instance, the selected DB instance must use the same DB engine and the same or a later version than the original DB instance.
     • Ensure that the storage space of the selected existing DB instance is greater than or equal to the storage space of the original DB instance. Otherwise, data will not be restored.

5. View the restoration result. The result depends on which restoration method was selected:
   

   Restoring from backups does not affect the performance of original DB instances.

   • 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 from 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 target existing DB 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.

     You can view the detailed progress and result of the task on the Task Center page. For details, see Viewing a Task.