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Replacing a cache service with a database
Why do we use caches at all? Can databases fully replace them?
Caches solve one important problem: providing pre-computed data at insanely low latencies, compared to databases. Using a full read replica that consumes terabytes of storage just to access a few gigabytes of hot data feels wasteful. Cache services can handle hundreds of thousands of concurrent connections, whereas databases generally don’t scale that way.
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