HKEYS command in Redis is commonly used when you need to retrieve all the keys present in a hash. This is helpful in scenarios when you want to inspect the contents of a hash or perform operations on all keys in it.
To use Redis
HKEYS with Java, you would typically use a library like Jedis. Here's an example:
In this example, we first connect to the Redis server using Jedis and then set up the hash 'user#1' with keys 'name' and 'email'. We then retrieve all the keys from this hash using
HKEYScan be useful, care should be taken when using it on large hashes, as it may consume a lot of memory and degrade performance.
hkeys: The returned set could be empty if the hash does not exist or contains no keys.
HKEYSon large hashes in a production environment. This can lead to performance issues.
HKEYS return the keys in any particular order?
HKEYS does not guarantee any specific order for the returned keys.
2. What happens if I use
HKEYS on a key that does not point to a hash?
You will get an error indicating that the key is not of hash type.