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Adding the same element multiple times will result in a set having a single copy of this element.Practically speaking this means that adding a member does not require a operation.The difference is that every member of a Sorted Set is associated with score, that is used in order to take the sorted set ordered, from the smallest to the greatest score. With sorted sets you can add, remove, or update elements in a very fast way (in a time proportional to the logarithm of the number of elements).Since elements are and not ordered afterwards, you can also get ranges by score or by rank (position) in a very fast way.
Please refer to the introduction to Redis data types for information about those types.
BLOBs and relational database data are very different entities.
Relational data usually consists of text or numbers and tends to be small.
Accessing elements is very fast near the extremes of the list but is slow if you try accessing the middle of a very big list, as it is an (constant time regardless of the number of elements contained inside the Set).
Redis Sets have the desirable property of not allowing repeated members.
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