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Quiz

2627 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 areas2627 Architecture Fundamentals81 Distributed Systems101 Data Architecture90 Cloud Architecture77 Networking86 API & Integration Architecture78 Reliability & Resilience88 Observability81 Performance & Capacity Engineering90 Security Architecture85 Cost Architecture & FinOps82 Business Architecture93 Architecture Communication91 Enterprise Architecture91 Legacy Modernization82 AI-Era Architecture86 Software Architecture & Engineering84 Architecture Patterns84 Architecture Decision-Making91 The Architect's Meta-Skills92 Delivery & Release Engineering93 Platform Engineering & Developer Experience92 Testing & Quality Architecture90 Data Platform Architecture88 Streaming & Real-Time Data93 Data Governance & Semantics81 Frontend & Experience Architecture91 Edge, Mobile & IoT88 Regulatory & Data Protection Architecture90 Assurance, Audit & Model Risk88
Difficulty Any beginner intermediate advanced

90 questions in Performance & Capacity.

  1. Bottleneck Analysis advanced

    A marketplace's search page is slow. CPU is moderate, memory is fine, and the database reports healthy query times. How do you find the bottleneck?

    2 min answer bottleneckuslqueueingmeasurement
  2. Bottleneck Analysis intermediate

    A service is slow and the team disagrees about the cause. What method identifies the actual bottleneck rather than the suspected one?

    2 min answer swiggybottleneckmethodmeasurement
  3. Bottleneck Analysis advanced

    A service's p99 latency has tripled over three months with no single obvious change. How do you investigate?

    2 min answer performanceprofilingmethodregression
  4. Bottleneck Analysis advanced

    CPU, memory, disk and network all look healthy, and the service will not go faster. What are you looking for?

    2 min answer bottlenecklogical-resourcessaturationcontention
  5. Bottleneck Analysis advanced

    p99 latency on the booking endpoint jumped from 300 ms to 4 s at 09:00 today. Error rate is normal. Walk through your diagnosis.

    2 min answer debugginglatencydiagnosismethod
  6. Caching for Performance intermediate

    A read-heavy content platform must scale. In what order should caching, replicas, denormalisation, CDN and query optimisation be applied, and what determines the order?

    2 min answer pratilipiread-heavycachingcdn
  7. Caching for Performance advanced

    A search platform adds a cache and sees only a small latency improvement. What are the likely reasons, and what should be measured?

    2 min answer cachinghit-rateworking-setzipf
  8. Caching for Performance intermediate

    A service adds an in-process cache in front of its shared Redis tier to remove a 1 ms round trip. What has the team given up, and at what scale does that bill arrive?

    3 min answer caching-performancenear-cachestalenessinvalidation
  9. Caching for Performance advanced

    What happens to your system if the entire cache tier is flushed at peak traffic?

    2 min answer cachecold-startcapacityfailure-modes
  10. Caching for Performance advanced

    Which caching failure appears only under load, and what are the fixes in order of deployability?

    2 min answer cache-stampedestale-while-revalidatecoalescingjitter
  11. Capacity Modelling advanced

    A compute platform must plan accelerator capacity where lead times are months, demand is uncertain, and jobs vary from minutes to weeks. How should the capacity model be built?

    2 min answer capacity-modellinglead-timeuncertaintyscheduling
  12. Capacity Modelling advanced

    A game hosts a scheduled in-world event for 30 million concurrent players. How should matchmaking, instance allocation, pre-scaling, login queues and degradation be planned, and what is rehearsed?

    3 min answer epic-gamesfortnitelive-eventsmatchmaking