Redis: Show database size/size for keys

Question

My redis instance seems to being growing very large and I\'d like to find out which of the multiple databases I have in there consumes how much memory. Redis\' INFO

Answer 1

So my solution to my own problem: After playing around with redis-cli a bit longer I found out that DEBUG OBJECT <key> reveals something like the serializedlength of key, which was in fact something I was looking for...

For a whole database you need to aggregate all values for KEYS * which shouldn't be too difficult with a scripting language of your choice...

The bad thing is that redis.io doesn't really have a lot of information about DEBUG OBJECT.

Answer 2

The solution from the comments deserves it's own answer:

redis-cli --bigkeys

Answer 3

MEMORY USAGE key command gives you the number of bytes that a key and its value require to be stored in RAM.

The reported usage is the total of memory allocations for data and administrative overheads that a key its value require (source redis documentation)