Pre-Deployment
Preparation and planning are done at this stage. An identification of the inter-dependencies between the application and the database is done and the workload of the database is analyzed to determine the appropriate migration strategy and instance sizing on RDS.
A suitable migration strategy is identified keeping in mind constraints and resource requirements.
Deployment
This phase involves designing the target database and data migration and validation.
Other actions undertaken include running the AWS Schema Conversion tool, making required application changes, running functional and performance tests, implementing suitable cutover strategies, and pointing applications to the newly migrated databases during downtime.
Post-Deployment
After successful database migration to RDS, post-deployment checks are performed to ensure the optimal performance of the RDS instance.
These tests ensure backups are present and confirm high availability and disaster recovery if required. They also test monitoring & alerting mechanisms and performance management.