SQL Server Migration Tools Compared: Microsoft, AWS, and CDC Options
The right SQL Server migration tool depends on the migration direction. Use the SSMS migration component for SQL Server upgrades, Azure DMS for supported Azure targets, BladePipe for heterogeneous or multi-cloud migration with full load plus CDC, and SSMA for supported databases moving into SQL Server.
This guide compares seven SQL Server data migration solutions by source and target support, schema conversion, online migration, and deployment scope.
SQL Server Migration Tools at a Glance
| Tool | Best for | Main migration direction | Online migration | Schema conversion |
|---|---|---|---|---|
| SSMS SQL Server migration component | Version upgrades and side-by-side SQL Server moves | SQL Server → newer SQL Server or SQL Server on Azure VM | No; uses backup, copy, and restore | Upgrade assessment, not heterogeneous conversion |
| Azure Migrate | Discovering and assessing large SQL Server estates | SQL Server estate → Azure planning | Assessment rather than row-level replication | No |
| BladePipe | Heterogeneous, hybrid, and low-downtime database migration | SQL Server ↔ supported databases, warehouses, lakes, and messaging systems | Yes, with full load plus CDC | Yes, for supported source-target pairs |
| Azure Arc-enabled SQL Server migration | Assessment and migration into supported Azure SQL targets | SQL Server → Azure SQL or SQL Server on Azure VM | Depends on target and migration path | Target compatibility assessment |
| Azure Database Migration Service | Managed SQL Server migration into Azure | SQL Server → supported Azure SQL targets | Yes, for supported online paths | Separate remediation may be required |
| SQL Server Migration Assistant | Converting non-SQL Server databases to SQL Server | Access, Oracle, MySQL, Db2, SAP ASE → SQL Server or Azure SQL | Primarily a conversion and migration workflow | Yes |
| AWS Database Migration Service | SQL Server migration into AWS and supported databases | SQL Server → RDS, Aurora, S3, Redshift, or supported engines | Yes, with CDC for eligible configurations | Usually paired with schema conversion work |
“Online migration” does not mean zero operational risk or zero write pause. Even when SQL Server migration software continuously replicates changes, the final cutover normally requires a controlled write boundary, replication catch-up, validation, and application routing changes.
DMA, SSMA, and the SSMS Migration Component Are Different Tools
Microsoft's migration tool names are easy to confuse:
- Data Migration Assistant (DMA) is the name many older guides use for SQL Server assessment and migration planning.
- SQL Server Migration Assistant (SSMA) converts supported non-SQL Server databases, such as Oracle or Access, into SQL Server or Azure SQL.
- The SQL Server migration component in SSMS is Microsoft's current workflow for assessing upgrades and moving SQL Server databases to a newer SQL Server instance.
- Azure Database Migration Service (Azure DMS) is an Azure-managed service for supported cloud migration paths.
Microsoft's current SQL Server migration tool comparison covers these tools and Fabric Migration Assistant. If a tutorial recommends SSMA, confirm that the source is a supported non-SQL Server database; SSMA is not the normal tool for SQL Server-to-SQL Server moves.
1. SQL Server Migration Component in SSMS
The SQL Server migration component in recent SSMS versions identifies breaking changes, deprecated features, and compatibility issues when upgrading SQL Server.
For physical migration, it uses backup, copy, and restore and can transfer eligible logins. Microsoft documents the workflow for SSMS 21 and later in its SQL Server upgrade migration guide.
Best for: Version upgrades, side-by-side SQL Server moves, Azure VM targets, and upgrade assessment.
Main limitations:
- It is a homogeneous SQL Server tool, not a general-purpose heterogeneous migration platform.
- Downtime depends on database size, transfer time, and cutover design.
- Microsoft notes that the network-share-based migration workflow is not used to migrate directly to Azure SQL Database or Azure SQL Managed Instance.
2. Azure Migrate
Azure Migrate inventories SQL Server estates, evaluates Azure readiness, and provides sizing or cost guidance.
It helps answer which databases are active, which Azure target fits, what compatibility blockers exist, how to size the target, and how to group migration waves.
Best for: Large SQL Server estates planning an Azure migration.
Main limitations: Azure Migrate is not a general CDC engine or a complete SQL Server migration solution. Depending on the selected target, the execution stage may use Azure DMS, an Azure Arc workflow, native backup and restore, or another supported method.
3. BladePipe
BladePipe is a SQL Server migration platform that combines schema migration, full migration, incremental synchronization, and data verification in a DataJob. It supports SQL Server as a source or target in documented migration and synchronization scenarios.
Best for:
- SQL Server migration to PostgreSQL or another supported engine;
- Hybrid and multi-cloud environments;
- Full-load-plus-CDC migration with a short final write pause;
- On-premises, managed cloud, or BYOC deployment.
Main limitations:
- It does not replace Microsoft's assessment for a SQL Server version upgrade.
- Supported connectors do not guarantee automatic conversion of every object or feature.
- Application SQL, stored procedures, instance objects, and target performance still require testing.
Verify the exact versions and source-target pair in the supported DataSources matrix. For the migration process, see the SQL Server database migration guide.
4. Azure Arc-Enabled SQL Server Migration
Azure Arc adds readiness assessment and guided Azure migration workflows to enabled SQL Server instances outside Azure.
This option is relevant when SQL Server instances already use Azure Arc for inventory, governance, assessment, or hybrid management.
Best for: Hybrid organizations that already manage SQL Server through Azure Arc and plan to migrate workloads into Azure.
Main limitations: Available migration capabilities depend on the source environment, Azure destination, region, permissions, and current service support. Confirm the exact path in Microsoft's documentation instead of treating Azure Arc as a universal database conversion tool.
5. Azure Database Migration Service
Azure Database Migration Service handles supported migrations to Azure SQL Database, Azure SQL Managed Instance, and SQL Server on Azure VM.
For eligible online paths, Azure DMS loads existing data and synchronizes changes until cutover. Microsoft documents it for supported SQL Server to Azure SQL Managed Instance migrations.
Best for: Supported SQL Server-to-Azure migrations, including eligible online paths with a short final cutover.
Main limitations:
- It is Azure-focused rather than multi-cloud.
- Supported online and offline modes vary by source and target.
- Server objects, unsupported features, T-SQL, schema differences, and application dependencies require separate assessment.
6. SQL Server Migration Assistant
SQL Server Migration Assistant has source-specific editions for Access, Db2, MySQL, Oracle, and SAP ASE.
SSMA converts supported schemas and objects, creates them in SQL Server or Azure SQL, and migrates the data. Microsoft's SSMA documentation lists current editions and targets.
Best for: Moving a supported non-SQL Server database into the Microsoft SQL Server ecosystem.
Main limitations:
- It does not use SQL Server as the source for a SQL Server-to-SQL Server migration.
- Complex stored procedures, application SQL, unsupported data types, and vendor-specific behavior still need manual review.
- It is not intended to provide general multi-cloud, bidirectional, or long-running CDC pipelines.
7. AWS Database Migration Service
AWS Database Migration Service supports SQL Server full-load and ongoing replication tasks to targets such as Amazon RDS, Aurora, S3, Redshift, and supported database engines.
AWS DMS reads changes from SQL Server for CDC, but prerequisites and limitations vary between self-managed SQL Server, SQL Server on Amazon EC2, and Amazon RDS for SQL Server. AWS documents these differences in its SQL Server source guide.
Best for: AWS-centered SQL Server migrations that need full load plus CDC on a supported path.
Main limitations:
- Heterogeneous schema conversion and application remediation are separate concerns.
- CDC behavior depends on SQL Server configuration and log availability.
- Replication sizing, task settings, networking, logging, and recovery require planning.
- Temporary migration and permanent replication have different operational requirements.
For a closer comparison of operational scope, see AWS DMS and BladePipe for migration and CDC.
Detailed SQL Server Migration Tool Comparison
| Evaluation criterion | SSMS migration component | Azure Migrate | BladePipe | Azure Arc | Azure DMS | SSMA | AWS DMS |
|---|---|---|---|---|---|---|---|
| SQL Server → newer SQL Server | Yes | Assessment | Supported pairs | Supported paths | Supported Azure paths | No | Supported AWS paths |
| SQL Server → Azure SQL | No direct migration | Planning | Supported pairs | Supported paths | Yes | No | No |
| Non-SQL database → SQL Server | No | No | Supported pairs | No | Limited paths | Yes, named sources | Supported engines |
| SQL Server → PostgreSQL | No | No | Supported pairs | No | No | No | Supported paths |
| SQL Server → AWS targets | No | No | Supported pairs | No | No | No | Yes |
| Estate-scale discovery | No | Yes | No | Yes | Limited | No | No |
| Schema conversion | Upgrade assessment | No | Supported pairs | Compatibility assessment | Separate remediation | Yes | Separate remediation |
| Initial full load | Backup and restore | No | Yes | Supported paths | Yes | Yes | Yes |
| Ongoing CDC | No | No | Yes | Depends on path | Supported paths | No | Yes |
| Data verification | Post-migration | No | Verification and correction | Depends on path | Migration validation | Limited | Rules and monitoring |
| Deployment scope | Local / VM | Azure | On-premises, cloud, BYOC | Hybrid Azure | Azure | Local client | AWS |
Verify current version, region, edition, source-target, data type, DDL, and feature support before implementation.
How to Choose a SQL Server Migration Tool
Choose by Downtime Requirement
If the application can stop for the duration of backup transfer and restore, a native homogeneous method is usually simpler. If the source must keep accepting writes during a long initial load, choose SQL Server migration software that supports log-based CDC for the exact source-target pair.
Also confirm that the tool retains the change position, resumes after interruption, monitors lag, applies deletes, handles schema changes, validates data, and supports controlled cutover.
Choose by Schema and Application Compatibility
Even homogeneous moves can encounter version, edition, collation, login, encryption, and feature differences. For heterogeneous moves, assess:
- Data type mappings and precision;
- Primary keys and identity behavior;
- Stored procedures, triggers, and functions;
- T-SQL embedded in applications;
- Collation and case sensitivity;
- Transaction and locking behavior;
- Server-level jobs, credentials, linked servers, and certificates.
Successful table creation does not prove application compatibility.
Choose by Operating Model
Cloud-native SQL Server migration services reduce infrastructure work but tie the workflow to that cloud. Self-hosted and BYOC migration platforms provide more network and data-plane control but require the team to own connectivity, credentials, capacity, monitoring, recovery, validation, and support.
Common Tool-Selection Mistakes
- Choosing by product name: DMA, SSMA, Azure DMS, and the SSMS component serve different migration directions.
- Treating assessment as data movement: Azure Migrate inventories and assesses; it does not move production rows.
- Assuming CDC means zero downtime: CDC shortens the write pause but does not remove cutover, validation, routing, or rollback work.
- Comparing connector counts: Confirm that the exact direction supports schema migration, full load, CDC, DDL, and validation.
- Ignoring instance objects: Plan separately for logins, Agent jobs, linked servers, credentials, certificates, SSIS packages, and monitoring.
FAQ
Is Microsoft Data Migration Assistant the same as SSMA?
No. SSMA converts supported non-SQL Server databases into SQL Server or Azure SQL; it is not another name for Data Migration Assistant.
What replaced Data Migration Assistant for SQL Server upgrades?
Microsoft's current upgrade guidance uses the SQL Server migration component in SSMS for assessment and side-by-side SQL Server migration.
Which tool migrates SQL Server to Azure SQL?
Use Azure DMS or a supported Azure Arc workflow. The correct option depends on whether the target is Azure SQL Database, Managed Instance, or SQL Server on Azure VM.
Which tool migrates SQL Server to PostgreSQL?
AWS DMS supports eligible AWS configurations, while BladePipe supports full-load and CDC workflows for supported SQL Server-to-PostgreSQL pairs. Both require schema and application compatibility work; see the SQL Server-to-PostgreSQL migration tutorial.