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In this presentation I will give you an idea of what Redis is, what it does, and why you might want to use it. Redis is an in-memory data structure store, supports strings, hashes, lists, sets, sorted sets. With a small set of API functions, is easy to learn. It can be used for a wide range of problems, not only for caching. Let start exploring a simple real use case: how the Joomla cache take advantages from Redis. Can be done more, some other use cases: sessions and statistics.
SQL or NoSQL, i'll try to give you enough information about how "NoSQL databases" works, to let you answer the question: "Make sense for my next project considering a NoSQL database ?