hard20 pts · first answer countscachingredis

Keeping a cache in sync

You cache user profiles in Redis using cache-aside (read from cache, on miss read DB and fill cache). When a profile is updated, which approach gives the least stale data in practice?

A.Update the cache first, then the databaseB.Update the cache and the database in parallel with Promise.allC.Commit the database write first, then delete the cache key, and keep a TTL as a safety netD.Never expire the cache; refresh it once a day with a cron job

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Keeping a cache in sync

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