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Cache-aside pattern

You add Redis in front of PostgreSQL using the cache-aside (lazy loading) pattern. What happens on a read when the key is not in Redis?

A.The request fails and the client must retry laterB.Redis automatically queries PostgreSQL and fills itselfC.The app returns an empty value and fills the cache in a nightly jobD.The app reads from PostgreSQL, writes the result into Redis with a TTL, and returns it

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Cache-aside pattern

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