Restoring Databases or Tables to a Point in Time

Scenarios

RDS allows you to restore databases or tables using point-in-time recovery (PITR). This ensures your data integrity and minimizes impact on the original instance performance. You can select databases or tables and restore them to a specified point in time. During database or table PITR, RDS downloads the most recent full backup from OBS and restores it to a temporary DB instance, and then replays binlogs to the specified point in time on the temporary instance. After that, data on the temporary instance is written to the target databases or tables of the original instance at an average speed of 20 MB/s.

The time required depends on the amount of data to be restored on the DB instance. Restoring databases or tables will not overwrite data in the DB instance. You can select the databases or tables to be restored.

RDS for MySQL allows you to restore databases or tables of one instance or multiple instances at a time.

Constraints

During a standard or fast table restoration, the foreign keys of tables containing foreign keys will be deleted and the table structures will be changed.
During table PITR, a maximum of 2,000 tables can be restored for one instance at a time.
During database PITR, a maximum of 2,000 databases and 20,000 tables can be restored for one instance at a time.
If you want to restore databases or tables of multiple instances at a time, the instances must be of the same engine version and in the Available state.
You can select a maximum of 20 instances at a time for PITR.
During the PITR, DB instances and read replicas cannot be rebooted or deleted, and their instance specifications cannot be modified.
During the PITR, the database or table information to be restored is read from the latest full backup before the selected time point. You can select any time point within the restoration time range. Therefore, a database or table can be restored to the earliest full backup time point when its information exists.
If a table you selected does not exist at the specified point in time, the table will not be restored.
Table-level PITR does not support view restoration. To restore a view, restore the tables involved in the view and create the view again.
Database-level PITR restores only table data in the databases. The new databases generated after restoration do not contain views.
If a DB instance has more than 20,000 tables, RDS does not collect the database and table metadata at a historical time point for performance purposes. Instead, RDS searches for the database and table information from the current instance for restoration. If the target database and table are not displayed but they do exist at the specified time point, you can create an empty database and table with the same names and restore them.

Prerequisites

After the restoration, a new database or table will be generated in the DB instance. Ensure that the DB instance has sufficient storage space for the generated database or table.

Restoring Databases or Tables of One Instance

Log in to the management console.
Click in the upper left corner and select a region.
Click in the upper left corner of the page and choose Databases > Relational Database Service.
On the Instances page, click the instance name.
In the navigation pane, choose Backups & Restorations. On the displayed page, click Restore Databases or Tables.
Specify restoration information and click Next: Confirm.
- To facilitate your operations, you can search for the databases or tables to be restored.
- After the restoration is complete, new databases or tables with timestamps appended as suffixes to original database or table names are generated in the DB instance. You can rename the new databases or tables.
- The new table name must be unique and consist of 1 to 64 characters. Only letters, digits, underscores (_), hyphens (-), and dollar signs ($) are allowed.
- Databases whose names contain periods (.) cannot be restored.
- Database-level PITR and table-level PITR are not supported for databases and tables that contain JSON virtual columns.
- Cold tables cannot be restored when you restore databases or tables using PITR.
- During database PITR, if you create new databases with the same names as the restored databases, the data in the new databases may be overwritten, causing data loss.
- During table PITR, if you create new tables with the same names as the restored tables, the data in the new tables may be overwritten, causing data loss.
- If the DB instance and the selected time point support fast restoration, you can select Fast for Restoration Mode.
- If your DB instance has XA transactions, select Standard for Restoration Mode because fast restoration can cause data loss.
On the displayed page, confirm the information and click Submit.
On the Instances page, check that the DB instance status is Restoring. During the restoration, services are not interrupted.

You can also view the progress and result of restoring databases or tables to a specified point in time on the Task Center page.

After the restoration is successful, you can manage data in the databases or tables as required.

Data is restored at an average speed of 20 MB/s.
Restoring databases or tables to a specified point in time does not affect new data. The restored database or table is a temporary database or table with a timestamp suffix. You can manage the data in the temporary database or table as required.

Restoring Databases or Tables of Multiple Instances in Batches

Log in to the management console.
Click in the upper left corner and select a region.
Click in the upper left corner of the page and choose Databases > Relational Database Service.
On the Instances page, select multiple instances and choose More > Restore Databases or Tables above the instance list.
Specify restoration information and click Next: Confirm.
- To facilitate your operations, you can search for the instances, databases, or tables to be restored by name.
- After the restoration is complete, new databases or tables with timestamps appended as suffixes to original database or table names are generated in the DB instance. You can rename the new databases or tables.
- The new table name must be unique and consist of 1 to 64 characters. Only letters, digits, underscores (_), hyphens (-), and dollar signs ($) are allowed.
- Databases whose names contain periods (.) cannot be restored.
- Cold tables cannot be restored when you restore databases or tables using PITR.
- During database PITR, if you create new databases with the same names as the restored databases, the data in the new databases may be overwritten, causing data loss.
- During table PITR, if you create new tables with the same names as the restored tables, the data in the new tables may be overwritten, causing data loss.
- During database PITR, a maximum of 2,000 databases and 20,000 tables can be restored for one instance at a time.
Figure 1 Restoring databases or tables of multiple instances in batches
On the displayed page, confirm the information and click Submit.
On the Instances page, check that the instances are Restoring. During the restoration process, services are not interrupted.

You can also view the progress and result of restoring databases or tables to a specified point in time on the Task Center page.

After the restoration is successful, you can manage data in the databases or tables as required.

Data is restored at an average speed of 20 MB/s.
Restoring databases or tables to a specified point in time does not affect new data. The restored database or table is a temporary database or table with a timestamp suffix. You can manage the data in the temporary database or table as required.