Sunday, July 28, 2013

MongoDB Fundamental

MongoDB Fundamental

 While going through learning MongoDB as NoSQL and BigData I have found very confusion with RDBMS as I am from I have finally clered by concept with below notes and slides.

One of the challenges that comes with moving to MongoDB is figuring how to best model your data. While most developers have internalized the rules of thumb for designing schemas for RDBMSs, these rules don't always apply to MongoDB. The simple fact that documents can represent rich, schema-free data structures means that we have a lot of viable alternatives to the standard, normalized, relational model. Not only that, MongoDB has several unique features, such as atomic updates and indexed array keys, that greatly influence the kinds of schemas that make sense. Understandably, this begets good questions.

MongoDB is a document database that provides high performance, high availability, and easy scalability.
  • Document Database
    • Documents (objects) map nicely to programming language data types.
    • Embedded documents and arrays reduce need for joins.
    • Dynamic schema makes polymorphism easier.
  • High Performance
    • Embedding makes reads and writes fast.
    • Indexes can include keys from embedded documents and arrays.
    • Optional streaming writes (no acknowledgments).
  • High Availability
    • Replicated servers with automatic master failover.
  • Easy Scalability
    • Automatic sharding distributes collection data across machines.
    • Eventually-consistent reads can be distributed over replicated servers.

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