Module 4
Caching Strategies
Learn how to dramatically improve performance with caching: from application-level patterns to CDNs and cache invalidation strategies.
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Cache-Aside Pattern
Check cache first, fetch from database on miss, then populate cache.
The most common caching pattern where the application manages the cache directly.
How It Works:
1Application checks cache first
2If cache miss, fetch from database
3Store result in cache
4Return data to user
Pseudocode:
data = cache.get(key)
if data is null:
data = database.query(key)
cache.set(key, data, TTL)
return dataPros:
•Application has full control
•Cache only contains requested data
•Resilient to cache failures
Cons:
•Cache misses are slow (3 round trips)
•Data can become stale
•Application complexity increases
Best For:
•Read-heavy workloads
•Data that doesn't change frequently
•When cache failures shouldn't break the app
Interactive: Cache Hit vs Miss
Click to simulate a request