
AWS DMS enables near-real-time migration of SQL Server AlwaysOn read-only replicas to Amazon Aurora PostgreSQL with minimal downtime using change data capture and AWS Schema Conversion Tool.


<div><p>This article explains how to migrate data from Microsoft SQL Server AlwaysOn read-only replicas to Amazon Aurora PostgreSQL using AWS DMS, minimizing downtime and operational overhead.</p><ul><li>Use secondary AlwaysOn replicas as migration source to avoid primary replica contention</li><li>AWS DMS enables near-real-time data replication via Change Data Capture (CDC)</li><li>AWS Schema Conversion Tool converts database schema from SQL Server to PostgreSQL</li><li>Configure ApplicationIntent=readonly in connection attributes to route to secondary replica</li><li>Primary database remains online during migration for continued application access</li><li>Monitor AWS DMS tasks using CloudWatch metrics and table statistics</li><li>Supports full load and ongoing replication with object-level granularity</li></ul><p>This approach enables seamless migration of mission-critical SQL Server databases to Aurora PostgreSQL with minimal downtime and reduced operational complexity.</p></div>


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