Deleting a set in Redis is commonly used when you no longer need it or want to clear its content. A 'set' is an unordered collection of strings in Redis, and removing a set can be required in various scenarios like cache management, temporary storage cleanup, etc.
For these examples, let's assume we're using the Jedis library for connecting Java with Redis.
In this example, we first connect to the Redis server at localhost. Then, we add two elements to the set 'mySet'. Finally, we delete the complete set 'mySet' using the
del command can take multiple keys, so we can delete more than one set at once. In this example, we create two different sets and delete them both in one command.
If you try to delete a non-existing set, Redis will not throw an error, it simply returns 0 as no keys were removed.
The time complexity of deleting a set in Redis is O(N), where N is the number of keys being deleted. So, if you're deleting multiple sets with large amounts of data, it could be a relatively costly operation.