title: Is there a way to load the mongodb indexes into the ram on startup?
body: <p>I am testing mongo db. I have 3 collections one of which is user collection and has 10 million documents. After indexing the collections it takes about 0,002 ms to query.  Anyway, after restarting the box -ubuntu 12.04 -  the same query takes about 200 ms. That is as if there was no indexes on collections. Is this normal behaviour of mongodb after rebooting the box? Is there a way to load the indexes into the ram on startup?</p>