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What's the easiest way to getting the number (count) of items in Redis set? Preferably without the need to dump whole set and count the lines... So far, I have found only BITCOUNT, which I have not found that useful...
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The SCARD command returns the cardinality (i.e. number of items) of a Redis set.
The first command you can use to get the total number of keys in a Redis database is the DBSIZE command. This simple command should return the total number of keys in a selected database as an integer value. The above example command shows that there are 203 keys in the database at index 10.
Redis sets are unordered collections of unique strings that act like the sets from your favorite programming language (for example, Java HashSets, Python sets, and so on). With a Redis set, you can add, remove, and test for existence O(1) time (in other words, regardless of the number of set elements).
The SCARD command returns the cardinality (i.e. number of items) of a Redis set.
http://redis.io/commands/scard
There is a similar command (ZCARD) for sorted sets.
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