The secondary replica must be configured using synchronous availability group replication. A SQL Server AlwaysOn availability group consists of a primary replica and a secondary replica. The following architectural diagram depicts the migration from SQL Server AlwaysOn Read Replica to Amazon Aurora PostgreSQL. For both disk-based and memory-optimized table types on the secondary replica, DML operations are allowed on table variables.To remove blocking contention on the secondary databases, read-only workloads use row versioning.Temporary statistics on a readable secondary database enhance read-only queries.It expands your overall processing for the systems that host readable secondary replicas.For any mission-critical workloads, having secondary workloads will offload the primary replica data load.The following are the key benefits of using a secondary availability group read-only replica: Key benefits of using a secondary availability group read-only replica For converting the database code from one database engine to another, use AWS Schema Conversion Tool (AWS SCT). It also provides object-level replication, which enables you to choose the objects that will be replicated to the target. AWS DMS Change Data Capture (CDC) can start and stop from a specific point in time. AWS DMS can use a on-premise secondary availability group replica as a source for on-going replication, also known as Change Data Capture. This also ensures the transactions are read from the source read replica endpoint in order to migrate to Amazon Aurora PostgreSQL efficiently.ĪWS DMS is used for data migration and can enable database engine changes with minimal downtime. We can use AWS Database Migration Service (AWS DMS) change data capture (CDC) to migrate data in near-real time. When your SQL Server mission-critical workloads are running on the primary SQL Server AlwaysOn replica, diverting the replication load to a secondary availability group replica gives better replication performance by avoiding SQL read contentions on the primary replica that are introduced by the replication. In this post, we explain the high-level steps to migrate data from a highly available on-premises Microsoft SQL Server AlwaysOn secondary read-only database to Amazon Aurora PostgreSQL-Compatible Edition with AWS Database Migration Service (AWS DMS). Customers are opting to replicate their critical workloads to Amazon Aurora PostgreSQL-Compatible Edition for ease of use, minimal operational overhead and the ability to break free from commercial licenses.
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