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Redis PSUBSCRIBE command is used to subscribe to channels matching the given patterns. Syntax Following is the basic syntax of Redis PSUBSCRIBE command. redis 127.0.0.1:6379> PSUBSCRIBE CHANNEL_NAME_OR_PATTERN [PATTERN...] Following listing shows some supported patterns…

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…

Redis PFMERGE command is used to merge multiple HyperLogLog values into a unique value that will approximate the cardinality of the union of the observed sets of the source HyperLogLog structures. Return…

Redis PFCOUNT command is used to get the approximated cardinality computed by the HyperLogLog data structure stored at the specified variable. If the key does not exist, then it returns 0. Return…

Redis PFADD command adds all the element arguments to the HyperLogLog data structure stored at the key name specified as first argument. Return Value Integer reply, 1 or 0. Syntax Following is…

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…

Redis ZSCAN command iterates the elements of Sorted Set types and their associated scores. Return Value Array reply. Syntax Following is the basic syntax of Redis ZSCAN command. redis 127.0.0.1:6379> ZSCAN key cursor [MATCH…

Redis ZUNIONSTORE command calculates the union of numkeys sorted sets given by the specified keys, and stores the result in the destination. It is mandatory to provide the number of input keys…