Redis – Sets Redis Sets are an unordered collection of unique strings. Unique means sets does not allow repetition of data in a key. In Redis set add, remove, and test for the existence of members in O(1) (constant time regardless of the number of elements contained inside the Set). The maximum length of a […]
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Redis – HyperLogLog Redis HyperLogLog is an algorithm that uses randomization in order to provide an approximation of the number of unique elements in a set using just a constant, and small amount of memory. HyperLogLog provides a very good approximation of the cardinality of a set even using a very small amount of memory […]
Redis – Publish Subscribe Redis Pub/Sub implements the messaging system where the senders (in redis terminology called publishers) sends the messages while the receivers (subscribers) receive them. The link by which the messages are transferred is called channel. In Redis, a client can subscribe any number of channels. Example Following example explains how publish subscriber […]