How does caching reduce database load?
WHAT IT TESTS: caching as a read-offload layer. OUTLINE: cache-aside reads, RAM-speed lookups, TTL plus invalidation. RED FLAG: treating the cache as durable source of truth or ignoring stale-data and invalidation.
WHAT IT TESTS: whether you treat caching as a read-offload layer, not a database. ANSWER OUTLINE: describe cache-aside, where the app checks the cache first and on a miss reads the DB then populates it; cover RAM-speed lookups, reduced query volume and connection pressure, and TTL plus explicit invalidation on writes to avoid stale reads. Note caching only helps when reads repeat. RED FLAG: calling the cache durable storage, ignoring invalidation, or assuming it helps write-heavy, low-repeat workloads with no read amplification.
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- #caching
- #redis
- #performance
- #databases
- #cache-aside
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