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AWS RDS SQL Server does not natively support an active-active cross-region replication topology.
Using DMS and CDC both RDS instances will be synchronized and can handle read and write workloads. However, you need to be cautious of potential conflicts that may arise when making write operations simultaneously in both regions.
If you require an active-active setup for disaster recovery purposes, you might also want to consider using Amazon Aurora with Global Database, which supports active-active cross-region replication. However, this would require migrating your SQL Server database to Amazon Aurora.
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