-Initiating scale up or scale down action in any of the flavors would restart database engine process and move it to a different virtual machine if needed. Moving database engine process to a new virtual machine is **online process** where you can continue using your existing Azure SQL Database service while the process is in progress. Once the target database engine is fully initialized and ready to process the queries, the connections will be [switched from source to target database engine](sql-database-single-database-scale.md#impact-of-changing-service-tier-or-rescaling-compute-size).
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