I'm not sure why this technique is MongoDB specific, since you can pretty much follow all the same steps with _any_ database that only writes to disk, and creat

I'm not sure why this technique is MongoDB specific, since you can pretty much follow all the same steps with _any_ database that only writes to disk, and create an 'in memory' version. In should be noted that if you really want a database that exists in RAM without messing with the filesystem mounts, SQLite supports this out of the box: http://www.sqlite.org/inmemorydb.html http://www.sqlite.org/inmemorydb.html