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2908 questions of the kind that actually get asked — in interviews, in architecture review boards, and by the person who has to run the thing at 3 AM. Every answer states the trade-off rather than the slogan, and says when the obvious choice is the wrong one.

All areas2908 Architecture Fundamentals91 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking86 API & Integration Architecture87 Reliability & Resilience99 Observability92 Performance & Capacity Engineering100 Security Architecture95 Cost Architecture & FinOps102 Business Architecture103 Architecture Communication102 Enterprise Architecture100 Legacy Modernization92 AI-Era Architecture96 Software Architecture & Engineering93 Architecture Patterns94 Architecture Decision-Making101 The Architect's Meta-Skills102 Delivery & Release Engineering103 Platform Engineering & Developer Experience102 Testing & Quality Architecture102 Data Platform Architecture98 Streaming & Real-Time Data103 Data Governance & Semantics91 Frontend & Experience Architecture101 Edge, Mobile & IoT98 Regulatory & Data Protection Architecture99 Assurance, Audit & Model Risk98
Difficulty Any beginner intermediate advanced

5 questions in Data Virtualisation.

  1. Data Virtualisation advanced

    A BI tool queries the operational read replica directly through a federation layer, avoiding a copy. At 09:03 replica lag starts climbing. By 09:12 checkout p99 has tripled. By 09:30 the replica is 40 minutes behind and support is reporting stale order status. What failed, and which design decision allowed it?

    3 min answer federationreplicaspushdownlag
  2. Data Virtualisation intermediate

    A federation layer serves 60 analysts across four sources: the lakehouse, a Postgres replica, a managed warehouse and a SaaS REST connector. At 11:40 the REST connector's upstream begins answering in 40 seconds rather than 200 ms. Nothing errors and nothing is down. Walk through what happens to the other analysts over the next ten minutes.

    3 min answer federationhead-of-line blockingbulkheadsconcurrency
  3. Data Virtualisation intermediate

    A group holds customer data in separate EU and US entities, and the rows may not be copied across the border. The board wants one revenue dashboard. The team puts a federation layer over both regions and queries in place rather than consolidating. What has that bought, when does the bill arrive, and how do they keep the option to reverse it?

    2 min answer federationresidencypushdowncross-region
  4. Data Virtualisation intermediate

    A platform proposes querying operational databases directly rather than copying data. When does that work?

    2 min answer virtualisationfederationcouplingload
  5. Data Virtualisation advanced

    A vendor proposes replacing your ingestion pipelines with data virtualisation — query everything in place, no copies. Assess it.

    1 min answer federationarchitectureevaluation