Cheapest way to cache data in node.js?

Question

I am implementing a node.js server running a matching algorithm. Since I want to keep the server responding as quickly as possible, I would like to be able to retrieve data from a cache instead of querying the database every single time. For example, I need to keep information about 10000 - 50000 users. My fear is that this would take up a lot of RAM. Is there any way to store that much data in a cache without the risk of running out of RAM?

Answer 1

You can use memcached or redis, who themselves care about memory and its lack removed obsolete data