THE SHORT ANSWER
Cache invalidation—knowing exactly when the underlying source of truth has changed.
Flashcards
Q1
What is a cache stampede?
When a popular cache key expires, and thousands of concurrent requests bypass the cache to hit the database simultaneously.
Q2
How does TTL misconfiguration cause silent data corruption?
By keeping deleted or updated records cached for too long, serving users outdated business rules without throwing explicit errors.
Q3
What is the difference between a write-through and write-behind cache?
Write-through updates the DB and cache simultaneously; write-behind updates the cache and asynchronously updates the DB later.
Related Concepts
Chaos Stack Field Notes FAQs
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AI Summary
This page covers The Cost of Fast Responses as a technical flashcard. Description: What is the hardest problem in software caching?.