Host Data Replicator

Last Edited




Originally, Host Data Replicator was a Microsoft database replication tool designed to facilitate the copying of data from legacy DB2 database tables on an IBM mainframe to Microsoft SQL Server database tables. It could execute these operations either on-demand or on a scheduled basis, ensuring that data was kept current across disparate database systems.

Host Data Replicator

Evolution from Legacy Systems

In the days of Windows NT and 2000, Host Data Replicator served as a vital tool, bridging the gap between evolving Microsoft technologies and existing IBM mainframe data. This tool has now evolved, with Microsoft introducing more advanced services and features in SQL Server, such as SQL Server Integration Services (SSIS) and Azure Data Factory, which provide robust data integration, transformation, and replication capabilities.

These modern solutions support a wider range of data sources, destinations, and real-time integration scenarios, far beyond the original capabilities of Host Data Replicator.

Modern Data Replication and Integration

Today’s data replication is not just about copying data—it’s about integrating complex data and supporting real-time business intelligence. Modern tools like SSIS and Azure Data Factory offer:

  • Advanced Transformation: Data is not only replicated but can also be transformed and cleaned, ensuring that the data in the target system is optimized for its intended use.
  • Real-Time Data Replication: With the need for real-time data access in business analytics, tools now support triggering replication as changes occur, not just on a schedule.
  • High Availability: Replication strategies now contribute to high availability and disaster recovery solutions, ensuring business continuity.

Towards Cloud Integration

The shift to cloud computing has significantly altered the replication landscape. Services like Azure SQL Database and Azure Synapse Analytics (formerly SQL Data Warehouse) extend replication capabilities to support hybrid and cloud environments. These services are designed for high scalability, performance, and global accessibility.


While the Host Data Replicator was a solution tailored to its time, modern businesses require tools that can seamlessly integrate diverse data systems, including cloud-based resources. Microsoft’s evolution from a service-oriented architecture in Windows NT to a cloud-centric model in Azure represents the broader shift in data replication from simple copying to complex, real-time data integration and analytics.