What is negative caching and when is it useful?

Problem Statement

Explanation

If a key is often requested but absent, a short-lived negative cache avoids repeated origin hits. Keep the TTL small so creation appears quickly. This is common for DNS and user lookups where non-existence is frequent.

Code Solution

SolutionRead Only

if(db.miss) cache.set(k, NULL, ttl=10s);

Practice Sets

This question appears in the following practice sets:

Caching & CDN Architecture

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What is negative caching and when is it useful?

Problem Statement

Explanation

Code Solution

Practice Sets

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Master Interviews Anywhere, Anytime

What is negative caching and when is it useful?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which statement best describes the Single Responsibility Principle?

Open–Closed Principle encourages what practice when adding features?

High-Level Design (HLD) typically focuses on which artifacts?

Which UML diagram best captures interactions over time between components?

Which pairing describes a healthy design goal?

More from System Design

Master Interviews
Anywhere, Anytime