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And it depends on how you define "DB". We've recently started using Redis for a number of things, and it has been incomprehensibly faster than our SQL database when it comes to rapidly finding and inserting records in (the equivalent of) a billion-row table. It's also far cheaper to run than significantly beefing up the database server just because of that one bottleneck. Easily worth the time and trouble of setting it up (neither of which was very much).

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