Lesson 03 · 11 min
Caching: cache-aside, TTL and invalidation
How to serve hot data from memory without showing stale data.
11 minLesson 3 of 10Practice includedAsk AI on any point
A cache keeps a copy of data where it is faster to read. A read from memory takes hundreds of nanoseconds, a network call to Redis in the same data center takes up to a millisecond, and a heavy SQL query can take tens or hundreds of milliseconds. If 90% of requests read the same 10% of data, a cache takes most of the load off the database.
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