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2988 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 areas2988 Architecture Fundamentals91 Distributed Systems111 Data Architecture100 Cloud Architecture97 Networking96 API & Integration Architecture97 Reliability & Resilience99 Observability92 Performance & Capacity Engineering100 Security Architecture105 Cost Architecture & FinOps102 Business Architecture103 Architecture Communication102 Enterprise Architecture100 Legacy Modernization102 AI-Era Architecture106 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

4 questions in Dimensional Modelling.

  1. Dimensional Modelling intermediate Multiple choice

    A BI team replaces a 9-table star schema with a single denormalised table of 240 columns because dashboards were slow and analysts kept joining at the wrong grain. Six months later the table is 4 TB across roughly 3 billion rows, the nightly build takes 5 hours, and correcting one product's category requires a full rebuild. Which property did the flattening actually trade away?

    3 min answer one big tabledenormalisationscdrebuild cost
  2. Dimensional Modelling advanced

    An interviewer says — design the data model behind a subscription business's revenue reporting. Finance restates prior periods when a contract is amended and the board pack must be reproducible months later. Where do you take this?

    3 min answer bitemporalrestatementgrainfinance
  3. Dimensional Modelling beginner Multiple choice

    An order-lines fact table holds 40 million rows per day for three years across 18 columns and is partitioned by order date. In Parquet it averages roughly 36 bytes per row compressed and columns are of similar width. A dashboard query reads three columns over the last 90 days. Roughly how many bytes does it scan?

    2 min answer estimationcolumnarpartition-pruningstar-schema
  4. Dimensional Modelling intermediate

    When is dimensional modelling still the right approach, and what does it cost?

    2 min answer dimensional-modellingstar-schemausabilityperformance