HKEYS command in Redis is typically used when you want to fetch all the fields (keys) present in a particular hash. It's useful when dealing with data structures where each field represents some sort of attribute and you need to know what attributes are available.
Let's consider a scenario where we have a hash named
user that stores basic user details like name, email, and age. Here's how you can get all the keys from this hash using python's redis package.
In this example,
hkeys returns all the fields in the hash named "user". The returned values are byte strings, so if you require them as normal strings, you might need to decode them accordingly.
HKEYSon large hashes in a production environment as it may lead to high latency. If you must fetch keys from large hashes, consider scanning the hash incrementally instead of loading all keys at once.
Not being aware that
HKEYS can lead to high latency when used on large hashes. This command may block the server for a long time when running against large hashes by consuming a lot of CPU and memory.
Q: What data does
HKEYS command returns all field names (keys) in the hash stored at a specified key.
Q: What happens if the specified key doesn't exist?
A: If the provided key doesn't exist,
HKEYS will return an empty list.