Write-Through Cache
A caching pattern where every write goes to both the cache and the database simultaneously. Ensures consistency but adds write latency.
What is Write-Through Cache?
A caching pattern where every write goes to both the cache and the database simultaneously. Ensures consistency but adds write latency.
Write-Through Cache is a foundational concept that sits in the Caching Strategies area of system design. Engineers reach for it whenever they need to reason about real-world trade-offs in that space — not just for textbook correctness, but because real production systems at companies like Netflix, Amazon, and Google make these decisions every day.
If you want to go deeper than this definition — with diagrams, code, and a quiz to lock it in — work through the "Write-Through Cache" lesson linked below. It walks through the why, the mechanism, the trade-offs, and how the giants actually use it in production.
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See also
Related glossary terms you might want to look up next.
Cache-Aside
A caching pattern where the application checks the cache first; on a miss, it fetches from the database and populates the cache. Also called lazy loading.
Write-Behind Cache
A caching pattern where writes go to the cache first and are asynchronously flushed to the database later. Fast writes but risks data loss on cache failure.
Caching
Storing frequently accessed data in a faster storage layer so you don't have to fetch it from the original (slower) source every time.