I have an Azure SQL in WEST US and I want to setup the failover grop with EAST US.
would Azure SQL Geo-replication/failover group cause any performance impact? If so, what would be the impact?
Azure SQL - would Geo-replication cause any performance impact?
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Talking about the impact In case of failure, There might be 2 scenarios : Planned Failure and Unplanned Failure.
For Planned Failure, Your primary database i.e. WEST US will first synchronize with secondary database i.e. EAST US. Then the EAST US db will become primary. This will prevent data loss.
For Unplanned Failure, The secondary db EAST US will immediately takeover as primary db. Data Loss might happen depending on previous synchronization time.
There will be a performance impact in both the cases. Latency will increase. Microsoft has defined some best practices to minimize this impact. Refer : https://learn.microsoft.com/en-us/azure/azure-sql/database/auto-failover-group-overview?tabs=azure-powershell#failover-groups-and-network-security