SDI — Systems Design Interview OS

Caching Impact Calculator

Quantify how caching reduces database load and improves response latency. Demonstrates the power of caching in system design trade-off discussions.

Effective Latency = \frac{cacheHitRate}{100} \times cacheLatencyMs + (1 - \frac{cacheHitRate}{100}) \times dbLatencyMs

Total Incoming QPS

req/s

Cache Hit Rate

Database Latency (per query)

Cache Latency (per lookup)

Cache Hits per Second--- req/s

Effective QPS to Database--- req/s

Avg Latency with Caching--- ms

Avg Latency without Caching--- ms

Latency Improvement--- %

DB Load Reduction--- %

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