• Data Warehouse Service

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  2. Data Warehouse Service
  3. User Guide
  4. Managing Snapshots
  5. Manually Creating a Snapshot

Manually Creating a Snapshot

Scenario

A snapshot is a complete backup that records point-in-time configuration data and service data of a data warehouse cluster. This section describes how to create a snapshot on the Snapshot Management page to back up cluster data.

Impact on the System

  • The cluster cannot provide services correctly during snapshot creation. When the snapshot is being created, the cluster is in the Unavailable state for a short time. During snapshot creation, the cluster changes to the Read-only state. After snapshot is created, the cluster changes to the Available state.
  • A cluster for which a snapshot is being created cannot be restarted. To ensure integrity of the snapshot data, stop writing data to the cluster when you are creating a snapshot.

Prerequisites

The cluster for which a snapshot is to be created must be in the Available, Read-only, or Low performance status.

Procedure

  1. Log in to the DWS management console.
  2. In the navigation tree on the left, click Snapshot Management.
  3. Click Create Snapshot.

    • Cluster Name: Select a data warehouse cluster from the drop-down list. The drop-down list only displays clusters that are in the Available state.
    • Snapshot Name: Enter a snapshot name.

      The snapshot name must be 4 to 64 characters in length and start with a letter. It is case-insensitive and contains only letters, digits, hyphens (-), and underscores (_).

    • Snapshot Description: Enter the snapshot information.

      This parameter is optional. The snapshot description contains 0 to 256 characters and does not support special characters !<>'=&".

    Figure 1 Creating a snapshot

  4. Click OK.

    Task status of the cluster for which you are creating a snapshot is Creating snapshot. The status of the snapshot that is being created is Creating. After the snapshot is created, its status becomes Available.

    NOTE:

    If the snapshot size is much greater than that of the data stored in the cluster, it is possible that data is labeled with a deletion tag, but is not cleared and reclaimed. Clear the data and create a snapshot again. For details, see section How Can I Clear and Reclaim the Storage Space?.