AWS DMS
AWS Database Migration Service (DMS) helps migrate databases to AWS quickly and securely. The source database remains fully operational during migration.
What is DMS? (Simple Explanation)
DMS is an AWS service in the Migration category. AWS Database Migration Service (DMS) helps migrate databases to AWS quickly and securely.
When Would You Use DMS?
- Homogeneous database migration (Oracle to Oracle)
- Heterogeneous migration (Oracle to Aurora)
- Continuous data replication for DR
- Data warehouse loading
- Database consolidation
Who Uses DMS?
From startups to enterprises, DMS powers:
What Makes DMS Powerful
DMS Pricing & Free Tier
DMS: from $0.018/hour for dms.t2.micro. DataSync: $0.0125/GB transferred.
DMS Best Practices
- 1Run a test migration on a non-production copy before the actual cutover
- 2Use AWS Schema Conversion Tool (SCT) for heterogeneous database migrations
- 3Enable DMS CloudWatch metrics — monitor CDCLatencySource and CDCLatencyTarget
- 4Validate migrated data with checksums or row counts after migration completes
- 5Keep the source database running in read-only mode until validation is confirmed
Getting Started with DMS in 5 Minutes
- 1Open the AWS Console and navigate to DMS
- 2Click "Create" or "Get started" to begin configuration
- 3Configure the required settings — name, region, and access permissions
- 4Review and create — monitor the initial status in CloudWatch
DMS CLI Quick Reference
2 production-ready commands. Full CLI Library (225+ services) →
aws dms describe-replication-tasks --query 'ReplicationTasks[*].{ID:ReplicationTaskIdentifier,Status:Status,Source:SourceEndpointArn,Target:TargetEndpointArn}' --output tableList all DMS replication tasks with statusaws dms describe-replication-instances --query 'ReplicationInstances[*].{ID:ReplicationInstanceIdentifier,Class:ReplicationInstanceClass,Status:ReplicationInstanceStatus}'List replication instancesPros & Cons of DMS
Pros
- One-time migration or ongoing replication
- Schema conversion with SCT (Schema Conversion Tool)
- CDC (change data capture) for minimal downtime
- Support for 20+ source and target databases
- Data validation to verify migration completeness
Cons
- ✕Vendor lock-in — migrating away from AWS requires significant effort
- ✕Costs can be unpredictable without proper monitoring and budgeting
- ✕Learning curve for beginners — AWS has 200+ services with complex IAM policies
DMS vs Alternatives
DMS vs RDS
Choose DMS for Homogeneous database migration (Oracle to Oracle) and Heterogeneous migration (Oracle to Aurora). It excels at one-time migration or ongoing replication.
Choose RDS as an alternative when your requirements differ. Each service in the Migration category serves different architectural patterns.
Services That Work with DMS
DMS is rarely used alone. It is typically combined with:
Compliance & Security
How AWS DMS fits into major compliance standards. Browse all 41 frameworks →
DMS configuration is audited by CIS Benchmarks v1.5–v3.0 for secure cloud defaults.
NIST 800-53DMS access controls, encryption, and audit logging map to NIST 800-53 AC, SC, and AU control families.
PCI DSS 4.0DMS encryption, access control, and logging support PCI DSS for cardholder data environments.
SOC 2DMS security, availability, and confidentiality controls evaluated under SOC 2 Trust Services Criteria.
ISO 27001DMS configuration and monitoring controls map to ISO 27001 Annex A information security management.
Frequently Asked Questions About DMS
What is AWS DMS?
AWS Database Migration Service (DMS) helps migrate databases to AWS quickly and securely. The source database remains fully operational during migration.
What is DMS used for?
DMS is commonly used for: Homogeneous database migration (Oracle to Oracle); Heterogeneous migration (Oracle to Aurora); Continuous data replication for DR; Data warehouse loading; Database consolidation. It's a core service in the migration category of AWS.
Is DMS free?
DMS: from $0.018/hour for dms.t2.micro. DataSync: $0.0125/GB transferred.
What are the key features of DMS?
DMS's most important capabilities include: One-time migration or ongoing replication. Schema conversion with SCT (Schema Conversion Tool). CDC (change data capture) for minimal downtime. Support for 20+ source and target databases. Data validation to verify migration completeness. Each of these is designed to help teams homogeneous database migration (oracle to oracle).
How does DMS compare to alternatives?
DMS competes with both AWS-native alternatives (RDS, Aurora, Redshift) and third-party equivalents. The right choice depends on your specific requirements for scalability, cost, and operational overhead. See the comparisons section below for detailed guidance.
Which compliance frameworks apply to DMS?
CIS AWS v3.0: DMS configuration is audited by CIS Benchmarks v1.5–v3.0 for secure cloud defaults. NIST 800-53: DMS access controls, encryption, and audit logging map to NIST 800-53 AC, SC, and AU control families. PCI DSS 4.0: DMS encryption, access control, and logging support PCI DSS for cardholder data environments. SOC 2: DMS security, availability, and confidentiality controls evaluated under SOC 2 Trust Services Criteria. ISO 27001: DMS configuration and monitoring controls map to ISO 27001 Annex A information security management.
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