How to determine the size of a single key in Redis

Question

How can I know the size (in KB) of a particular key in redis?
I'm aware of info memory command, but it gives combined size of Redis instance, not for a single key.

Answer 1

I know this is an old question but, just for the record, Redis implemented a memory usage <key> command since version 4.0.0.

The output is the amount of bytes required to store the key in RAM.

Reference: https://redis.io/commands/memory-usage ‏