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Aporeon

Technical interview practice, from one developer to another.

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Caching & Redis Essentials

Cache boundaries, cache-aside reads, freshness, invalidation, scoped keys, Redis operation, stampede control, degraded behavior, leases, hot keys, eviction, security, and observability.

15 drillsPractice one at a timeOrdered pathComparison questionConcept question

Recommended start

Memory vs Distributed

Explains when local process memory is enough and when shared Redis-style caching is worth the extra dependency.

Easy~5 minStep 1 of 15

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15 of 15 shown

1Memory vs DistributedRecommended startExplains when local process memory is enough and when shared Redis-style caching is worth the extra dependency.Comparison questionEasy~5 min.NETASP.NET CoreRedisPractice 2Cache-aside ReadsExplains the cache-aside pattern for read-heavy endpoints and how misses, TTLs, and source-of-truth reads fit together.Concept questionEasy~5 min.NETASP.NET CoreRedisPractice 3TTL StrategyExplains how TTL choices balance freshness, load reduction, user expectations, and operational safety.Concept questionEasy~5 min.NETASP.NET CoreRedisPractice 4InvalidationExplains delete-on-write, versioned keys, event-driven invalidation, and the race conditions around cache freshness.Concept questionMedium~7 min.NETASP.NET CoreRedisPractice 5Scoped Cache KeysExplains cache-key scope for tenant, user, role, locale, filters, response version, and security-sensitive reads.Concept questionMedium~7 min.NETASP.NET CoreRedisPractice 6Stale DataExplains when stale cache reads are acceptable, when they are dangerous, and how to make freshness visible.Concept questionMedium~7 min.NETASP.NET CoreRedisPractice 7Redis ConnectionsExplains why Redis connections are reused, how timeouts protect API threads, and how to diagnose client-side Redis pressure.Concept questionMedium~7 min.NETASP.NET CoreAzurePractice 8SerializationExplains cached value serialization, schema versioning, deploy compatibility, and safe handling of old payloads.Concept questionMedium~7 min.NETASP.NET CoreRedisPractice 9StampedeExplains what happens when a hot key expires and how request coalescing, TTL jitter, background refresh, and stale serving help.Concept questionMedium~7 min.NETASP.NET CoreRedisPractice 10Redis OutageExplains how an API behaves when Redis is unavailable and which cache usages can safely fall back.Concept questionMedium~7 min.NETASP.NET CoreAzurePractice 11Locks and LeasesExplains the risks of Redis-based distributed locks and when database constraints, queues, or idempotency are safer.Concept questionHard~9 min.NETASP.NET CoreRedisPractice 12Hot KeyExplains hot-key behavior, traffic concentration, partition pressure, payload size, and mitigation options.Concept questionHard~9 min.NETASP.NET CoreRedisPractice 13EvictionExplains Redis memory pressure, eviction policies, key sizing, TTL discipline, and what happens when the cache is full.Concept questionMedium~7 min.NETASP.NET CoreRedisPractice 14Permission CacheExplains why cached authorization decisions are risky and how to bound or invalidate permission-related cache safely.Concept questionHard~9 min.NETASP.NET CoreRedisPractice 15Cache MetricsExplains cache observability across hit rate, latency, source load, memory, evictions, stale data, and fallback behavior.Concept questionEasy~5 min.NETASP.NET CoreAzurePractice

Practice order

15 drillsOne at a time

1Memory vs DistributedUp next / Easy / ~5 min
2Cache-aside ReadsEasy / ~5 min
3TTL StrategyEasy / ~5 min
4InvalidationMedium / ~7 min
5Scoped Cache KeysMedium / ~7 min
6Stale DataMedium / ~7 min
7Redis ConnectionsMedium / ~7 min
8SerializationMedium / ~7 min

+7 more drills in this section