MongoDB is a scalable, high-perfomance, open source, document-oriented database written using C++. It actually creates a bridge between traditional RDBMS and data storage key.
How does MongoDB relates to MongoHQ?
MongoHQ provides a hosting platform for MongoDB and also uses MongoDB as the back-end tool for its applications. MongoHQ is the hosted database solution for easily uploading your application and running with MongoDB.
References
MongoDB (2010). The best features of document databases key – Value stores, andRDBMSes. Retrieved from www.Mongodb.org
B) What is Mongo Mapper?
“MongoMapper is ruby wrapper library which aims to make using MongoDB in easy and user friendly way.” Github(2010)
As we know MongoDB stores data, MongoMapper consists two key concepts to makes process simple. The two concepts are Document and EmbeddedDocument.
References
Github (2010). MongoMapper. Retrieved from http://wiki.github.com/jnunemaker/mongomapper/
C) What is the relation between MongoDB and Mysql?
According to mongodb.org (2010) there are few similarities between MongoDB and Mysql. The below table explain them all.
mongoDB (2010). MongoDB, CouchDB, MySQL Compare Grid . Retrieved from http://www.mongodb.org/display/DOCS/MongoDB,+CouchDB,+MySQL+Compare+Grid
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