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Quiz

2948 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 areas2948 Architecture Fundamentals91 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking96 API & Integration Architecture87 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

6 questions in Polyglot Persistence.

  1. Polyglot Persistence advanced

    A delivery platform migrated parts of its data estate to CockroachDB and other parts to Aurora. What evidence distinguishes workloads that justify a distributed SQL database from those better served by a single-writer managed Postgres?

    2 min answer doordashcockroachdbauroradistributed-sql
  2. Polyglot Persistence intermediate

    A developer platform accumulates a relational database, an object store, a search index, a cache, a queue and a time-series store. When is this justified polyglot persistence, and when is it accidental sprawl?

    2 min answer polyglot-persistenceoperational-costconsolidationgitlab
  3. Polyglot Persistence intermediate

    A team wants to add a graph database for a "people you may know" feature. The system currently runs on one PostgreSQL instance. Evaluate.

    2 min answer polyglotgraphoperationsnetflix
  4. Polyglot Persistence advanced

    A trading platform is considering a relational database, a key-value store, a time-series store and a search engine. What justifies each, and what is the cost of running four?

    2 min answer zerodhapolyglotdatastore-selectionoperations
  5. Polyglot Persistence advanced

    Four services want four different databases: Postgres, MongoDB, Cassandra and Neo4j. What do you say?

    2 min answer polyglotoperationsdecision-makingstandards
  6. Polyglot Persistence advanced

    Your search index and your database disagree — some products appear in search that were deleted, and some new ones never appear. How do you make this reliable?

    2 min answer consistencyindexingoutboxreconciliation