All Products
Search

This Product

    Database Backup:Restore a PolarDB for MySQL database

    Document Center

    Database Backup:Restore a PolarDB for MySQL database

    Last Updated:Feb 29, 2024

    This topic describes how to use Database Backup (DBS) to restore a PolarDB for MySQL database from a backup. You can use this feature to restore a PolarDB for MySQL database after an accidental operation and analyze historical data.

    Prerequisites

    The database that you want to restore is backed up. For more information, see Back up a PolarDB for MySQL database by using logical backup.

    Procedure

    1. Log on to the Database Backup (DBS) console.

    2. In the left-side navigation pane, click Backup Schedules. In the top navigation bar, select a region.

    3. On the Backup Schedules page, find the backup schedule that you want to manage and click Manage in the Actions column.

    4. On the Configure Task page, click Restore Database in the upper-right corner.

    5. In the Set Time Restored To step of the Create Restore Task wizard, configure the parameters that are described in the following table and click Next.

      PolarDB MySQL恢复

      Section

      Parameter

      Description

      N/A

      Task Name

      The name of the restore task. DBS automatically generates a task name. We recommend that you specify a name that can help you identify the task. Task names do not need to be unique.

      Set Time Restored To

      Time Range Available to Restore

      The time range from the point in time when the first full backup set is created to the point in time when the latest full backup set is created. The database can be restored to a point in time within the time range.

      Restore To

      The point in time to which you want to restore the source database. The value must be within the time range that is specified by the Time Range Available to Restore parameter.

      Note

      • If the incremental backup feature is enabled, DBS allows you to restore the data to a point in time from the completion of the first full backup to the completion of the last incremental backup.

      • If the incremental backup feature is disabled, DBS allows you to restore the data to a point in time when a full backup is complete.

      Configure Destination Database

      Target database instance type

      Select Use Exists. In this example, the backup set is restored to the source PolarDB instance.

      Database Location

      The location of the destination database. Select PolarDB.

      Instance Region

      The region in which the destination database resides.

      Database Type

      The type of the database that you want to restore. Default value: MySQL.

      PolarDB Instance ID

      The ID of the PolarDB for MySQL instance to which you want to restore the source database.

      Database Account

      The username of the account that is used to connect to the destination database. The account must have the write permissions on the database.

      Password

      The password of the account that is used to connect to the database that you want to back up.

      Compliance warranty regarding cross-border data transfers

      Read and agree to the compliance commitment by selecting the check box.

    6. In the Configure Objects to Restore step, configure the parameters that are described in the following table and click Precheck.

      Parameter or setting

      Description

      Conflict Handling

      By default, Rename Object with the Same Name is selected for the Conflict Handling parameter. For example, if the job_info table shares the same name with another table during the restoration, the system renames the new table to job_info_dbs_<restoration task ID>_</timestamp> by default.

      Objects to Restore

      Select the database or table that you want to restore in the Available section and click the right arrow to add it to the Selected section.

      Note

      DBS allows you to restore a single database or table. This reduces the amount of data to be restored and shortens the recovery time objective (RTO).

    7. If the Precheck Passed message appears in the Precheck dialog box, click Start Task.

      You can click Restore Tasks in the left-side navigation pane to view the database restoration progress.

      Note

      The duration of the restoration depends on the specification of the backup schedule and the size of the database. Less time is required for the restoration of a backup schedule with higher specifications. For more information, see Performance tests on backup and restoration.

    Related operations

    • You can also directly create, start, or view a restoration task by calling an API operation. For more information, see CreateRestoreTask, StartRestoreTask, or DescribeRestoreTaskList.

    • If the backup data at the specified point in time does not meet your business requirements, you can click Start Full Data Backup in the upper-right corner of the Full Data page to manually back up the database. After the backup is complete, configure a restoration task to restore the database to the point in time of the latest full backup.

    • If an exception or error occurs in the restoration task, refer to Common Errors and Troubleshooting for troubleshooting.