Is there a practical limit to the number of elements in a sorted set in redis?

It depends what you want to do with the set. The simple operations are mostly O(log n) which means that they take only twice as long for a million item set as they do for a thousand item set. Unless you have something seriously broken in your config like a memory limit smaller than the set, performance shouldn't be a problem Where you need to be careful is with operations on multiple sets, particularly union - that will take a thousand times longer for the million item set.In practical terms this isn't necessarily a problem though - either it will be fast enough for your purposes anyway (redis has commands documented as too slow for production use that are still best measured in milliseconds) or you can adjust the order of operations to avoid running union on really large sets.

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