I have solved this question by myself.
Finally I found a great post with interesting topic.
I have installed a forum with Redis but it going to get all of my RAM.
I want to transfer data form Redis to MongoDB.
Can I do that?
Thank you very much.
How much RAM is it using right now? You can check by running
@julian I've just inform the users and reinstall it on mongoDB my VPS has only 1GB RAM.