AWS Certified Solutions Architect Professional SAP-C02 Practice Question
A company operates an 8 TB Microsoft SQL Server Enterprise 2016 database that supports its business-critical order-processing application. Management wants to migrate the workload to AWS to reduce ongoing licensing costs. The application relies on hundreds of T-SQL stored procedures and functions and requires automatic, database-level failover within the same Region. The operations team has limited DBA capacity and prefers a fully managed service that minimizes application changes and downtime.
Which database platform will meet these requirements MOST cost-effectively?
Amazon DynamoDB tables migrated with AWS Database Migration Service and configured with on-demand capacity mode
Self-managed PostgreSQL on Amazon EC2 instances using streaming replication across two Availability Zones
Amazon RDS for SQL Server Enterprise Edition in a Multi-AZ configuration
Amazon Aurora PostgreSQL-Compatible Edition with Babelfish enabled, deployed as a Multi-AZ cluster
Amazon Aurora PostgreSQL-Compatible Edition with Babelfish lets Aurora understand the SQL Server Tabular Data Stream protocol and most common T-SQL syntax, so the existing application can connect with little or no code change. Aurora is fully managed and maintains six copies of data across three Availability Zones, automatically promoting a replica on failure, so in-Region high availability is built in. Because Aurora uses an open-source engine, no Microsoft SQL Server licenses are required, eliminating the significant Enterprise-edition licensing costs.
Running RDS for SQL Server preserves the familiar engine but still charges for SQL Server licenses, so the main cost-reduction goal is not achieved. Migrating to DynamoDB would remove licensing fees but would force a complete rewrite of the relational schema and T-SQL logic. Self-managing PostgreSQL on EC2 also removes license costs but shifts backups, patching, and failover automation to the operations team, contradicting the requirement for a fully managed service.
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