PFADD

PFADD command used to add elements to a HyperLogLog data structure, which is designed for estimating the cardinality (number of unique elements) of a dataset. When elements are added using PFADD, Redis updates the internal structure without storing the actual elements, ensuring low memory consumption. This command returns 1 if the HyperLogLog was modified (i.e., a new unique element was added) and 0 otherwise. PFADD is ideal for use cases like counting unique visits or tracking unique events in a highly memory-efficient manner.

Learn more from the following resources:

• @official@PFADD