Which database is better acc to Performance factor.
The accepted answer explains it well. It all depends on what you're doing with it. If you're using it to store/retrieve a lot of (large) files, use Mongo.
I am doing research on mongodb and mysql comparison.
Can you give some Direction(some points ) to find out the differences b/w above databases.
MySQL is a traditional RDMBS, MongoDB is document oriented storage. Google "mysql versus mongodb".