Bloom Filter Database Shield

A space-efficient probabilistic data structure that tests whether an element is a member of a set. False positives are possible, but false negatives are impossible.

STAFF ENGINEER TAKEAWAY: If the Bloom filter says "Not in Set", it is 100% guaranteed, allowing systems to bypass expensive disk and database lookups.

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More Topics in 4. Performance

⚡Distributed Caching Strategies

High-speed in-memory key-value data stores positioned in front of slower relational databases to reduce read latency from 20ms to <1ms.

🌍Content Delivery Networks (CDN)

A geographically distributed network of proxy edge servers that caches static assets (images, videos, JS/CSS) and terminates TLS close to end users.

📦Cache-Aside (Lazy Loading) Pattern

The application code explicitly queries the cache first. On a cache miss, it reads from the database and populates the cache for subsequent requests.

✍️Write-Through Caching Pattern

Data is written simultaneously to the cache and the primary database in a single synchronized transaction before acknowledging the client.