is there any easy way to change the database from mysql to mongoDB ?
or better any one suggest me good tutorial do it
If you're using Ruby, you can also try: Mongify
It's a super simple way to transform your data from a RDBS to MongoDB without losing anything.
Mongify will read your mysql database, build a translation file for you and all you have to do is map how you want your data transformed.
It supports:
Read more about it at: http://mongify.com/getting_started.html
There is also a short 5 min video on the homepage that shows you how easy it is.