Season 2

Namaste Power BI

Episode 28

Aggregation Tables & Dual Mode Strategy

⏱ 40:00

Episode Summary

Performance engineering with aggregation tables — pre-computing summary data to accelerate DirectQuery models, using Dual storage mode for intelligent query routing, and optimizing composite models.

This is Episode 28 of the free Namaste Power BI course on DevWithData — covering aggregation tables & dual mode strategy. Watch the video above, then pass the MCQ checkpoint to unlock the next episode and update your Data Readiness Index score.

Key Takeaways

→Aggregation tables store pre-computed summaries at a higher grain
→Dual mode tables can be queried via VertiPaq or pass-through to DirectQuery
→Power BI automatically routes queries to aggregations when the grain matches
→Manage aggregations through the "Manage aggregations" dialog in Model view

⚠ Common Interview Pitfalls

•Not matching aggregation grain to the most common query patterns
•Forgetting to hide the aggregation table from report view
•Using aggregation tables without testing query routing behavior

Official Reference

Deepen your understanding with official Microsoft documentation.

PL-300 Official Training Course

Microsoft's official instructor-led training for the Power BI Data Analyst certification.

https://learn.microsoft.com/en-us/training/courses/pl-300t00

Power BI Documentation

Complete reference for Power BI Desktop, Power BI Service, and Power BI Embedded.

https://learn.microsoft.com/en-us/power-bi/

Content on DevWithData is original and inspired by official Microsoft resources. The links above point directly to Microsoft Learn — always the authoritative source.

← Ep 28: Deployment Strategy (Dev → Test → Prod)

Ep 29: DirectQuery & Hybrid Models →

Episode Checkpoint

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