#31: Redis

Redis is quite a versatile NoSQL, key-value database. Or in-memory cache. Or pub/sub broker. With transactions, stored procedures and fast replication. It’s quite universal. Anyway, the main use-case for Redis is caching. Internally the whole dataset must fit in memory. Redis can optionally persist data on disk, but all online operations happen entirely in memory. This makes Redis extremely fast. It’s often used as an alternative to the widespread Memcached server.

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