Get the REDIS keys size and print the ones taking more space (in ruby)

find_largest_redis_keys.rb

# store all keys with their memory value
keys_by_val = {}
keys = REDIS.keys('*').each do |key|  
  mem = REDIS.memory('usage', key)
  keys_by_val[key] = mem
end

# order them by value
ordered = keys_by_val.sort_by { |k,v| v ? v : 0 }

# print the biggest keys
ordered.last(100).each do |oo| 
  p "key:#{oo.first} - memory used: #{oo.last / 1024} Kb"
end