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1 When would you NOT choose Redis as your primary database?
2Compare RDB and AOF. When would you use RDB+AOF together?
3What is AOF rewrite, and what problems can it cause in production?
4How would you tune Redis for zero data loss?
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When would you NOT choose Redis as your primary database?

Redis is an in memory database and not suitable for use cases which require persisting data.

  1. 1

    When data exceeds available RAM budget and you can't afford Redis on Flash or sharding

  2. 2

    When you need complex relational joins, foreign keys, or multi-table ACID transactions

  3. 3

    When your query patterns require full-text search without a module like RediSearch

  4. 4

    When data must survive without any persistence risk (safety-critical systems)

  5. 5

    When strong consistency across distributed nodes is mandatory (Redis Cluster is AP, not CP)