Help Center> Data Warehouse Service (DWS)> Management Guide> Backup and Disaster Recovery> Snapshots> Restoration Using a Snapshot> Constraints on Restoring a Snapshot

Updated on 2024-06-14 GMT+08:00

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Constraints on Restoring a Snapshot

Cluster-Level Snapshot Restoration

Cluster-level restoration consists of two steps:

Data restoration: Restores data in the backup set to the data directory of each primary DN/CN instance in parallel.
Rebuilding the standby DN: After the primary DN is restored, standby DNs are rebuilt with full data in parallel.

The restoration process takes 1.5 to 2 times longer than the backup process.
The parameters after cluster-level restoration are the same as those before backup. When restoring data to a new cluster, ensure that the flavor of the new cluster is the same as that of the original cluster. If the flavor of the new cluster is smaller, the restoration may fail.

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