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Target customers: users who want to change the zone or VSwitch. Features released: if the destination zone is a secondary zone, data migration is not required. The system only needs to change the database compute nodes. The average time that it takes to change a node is five minutes, so the data center switchover can be completed relatively quickly. This operation is usually used for disaster recovery tests. If the destination zone is not a secondary zone, you must migrate data. How long the data migration takes depends on the data capacity. It may take several hours. Perform this operation with caution. This operation is generally used to adjust the zone distribution of applications and databases to facilitate nearby access to the databases.