What is data virtualization and when is it useful in CDX?

• A. A physical replication of all data into a single store
• B. A virtualized data access layer that queries multiple sources without replication; enables unified views and faster insights
• C. A traditional ETL process
• D. A security mechanism for data access

Answer: (B)

Data virtualization is a virtualized data access layer that queries and combines data from multiple sources without physically moving or duplicating the data. It presents a unified, real-time view to applications and analysts, so a single query can pull from databases, data lakes, SaaS apps, and streaming sources as if they were one source.

In CDX contexts, data sits in silos across CRM systems, marketing platforms, product databases, and data warehouses. This approach lets you create a unified customer view and run faster, broader analyses without building and maintaining a replicated data store. You can shape and enrich data on the fly, apply governance and security at the access layer, and avoid the time and cost of traditional ETL and data replication. It’s about live, cross-source access rather than moving data into a single repository, which is why this option best captures what data virtualization is and when it’s useful.