I am going to build a page that is designed to be "viewed" alot, but much fewer users will "write" into the database. For example, only 1 in 100 users may post his news on my site, and the rest will just read the news.

In the above case, 100 SAME QUERIES will be performed when they visit my homepage while the actual database change is little. Actually 99 of those queries are a waste of computer power. Are there any methods that can cache the results of the first query, and when they detect the same query in a short time, can deliver the cached result?

I use MongoDB and Tornado. However, some posts say that the MongoDB does not do caching.

Making a static, cached HTML with something like Nginx is not preferred, because I want to render a personalized page by Tornado each time.