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Understanding AWS DMS: A High-Level View!

AWS is undoubtedly one of the market’s oldest cloud service providers. Under the name Amazon Web Services, it first appeared as a specialised web services solution with a wide range of web hosting suites, add-ons, and plugins. AWS, now more commonly known, has developed to provide business cloud solutions with a sizable number of APIs and third-party integration services while maintaining its open-source design.

One thing is certain that AWS continues to be the most popular PaaS model and is still almost associated with cloud storage services for many market sectors and industries, despite comparisons that could challenge that claim.

How does AWS DMS function?

AWS DMS is a managed and automatic migration solution that allows you to transfer data from one database to the other. The process starts by coupling DMS to the endpoints (source and target). One of your endpoints must be hosted on an AWS service as the main prerequisite for utilising AWS DMS.

Consider AWS DMS to be a server that runs replication software within the AWS cloud. To tell AWS DMS where to extract and send the data, you must provide a source and a destination connection. Planning a server-side procedure to migrate your data is now possible. AWS DMS will build the necessary tables and primary keys if they don’t already exist at the destination. The target tables can also be created from scratch.

Phases of AWS DMS

An AWS DMS task can comprise three major phases:

  • Migration of existing data (Full load)- When a complete load migration is performed, AWS DMS loads data from tables on the source data store to tables on the targeted data store.
  • The application of cached changes- AWS DMS quickly starts to apply the cached modifications for a specific table once the whole load for that table is finished. Tables are transactionally consistent following application of all cached changes by AWS DMS.
  • Ongoing replication (Change Data Capture)- AWS DMS starts implementing modifications as transactions during this phase. You can now close your applications, let any pending transactions be applied to the target, and then restart them so that they are directed at the target database.

Want to learn more about the AWS DMS? Click here.


In a nutshell, through the AWS Database Migration Service (DMS), you can quickly and securely migrate databases from on-premises databases, DB instances, or databases running on AWS EC2 instances to the cloud. You may use it to manage, change, and transfer your AWS cloud configurations. There are several databases accessible, including Amazon RDS, Aurora, DynamoDB, ElasticCache, and Redshift. Both homogeneous (Oracle to Oracle) and heterogeneous (Amazon Aurora to Oracle) database conversion are supported by AWS DMS.

Although, the process of AWS DMS sometimes becomes tricky. In order to prevent this, contact our team of experts at PITS for your AWS DMS needs.