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MongoDb - Details on the POC
 

MongoDb - Details on the POC

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    MongoDb - Details on the POC MongoDb - Details on the POC Presentation Transcript

    • Goodbye rows and tables, hello documents and collections
    • Lots of pretty pictures to fool you.
    • Noise
    • Introduction M ongoDB bridges the gap between key-value stores (which are fast and highly scalable) and traditional RDBMS systems (which provide rich queries and deep functionality). MongoDB is document-oriented , schema-free , scalable , high-performance , open source. Written in C++ Mongo is not a relational database like MySQL Goodbye rows and tables, hello documents and collections
      • Features
      • Document-oriented
        • Documents (objects) map nicely to programming language data types
        • Embedded documents and arrays reduce need for joins
        • No joins and no multi-document transactions for high performance and easy scalability
      • High performance
        • No joins and embedding makes reads and writes fast
        • Indexes including indexing of keys from embedded documents and arrays
      • High availability
        • Replicated servers with automatic master failover
      • Easy scalability
        • Automatic sharding (auto-partitioning of data across servers)
          • Reads and writes are distributed over shards
          • No joins or multi-document transactions make distributed queries easy and fast
        • Eventually-consistent reads can be distributed over replicated servers
      • Cost - MongoDB is free
      • MongoDb is easily installable.
      • MongoDb supports various programming languages like C, C++, Java,Javascript, PHP.
      • MongoDB is blazingly fast
      • MongoDB is schemaless
      • Ease of scale-out
      • If load increases it can be distributed to other nodes across computer networks.
      • It's trivially easy to add more fields -- even complex fields -- to your objects.
      • So as requirements change, you can adapt code quickly.
      • Background Indexing
      • MongoDB is a stand-alone server
      • Development time is faster, too, since there are no schemas to manage.
      • It supports Server-side JavaScript execution.
      • Which allows a developer to use a single programming language for both client and server side code
      Why ?
      • Mongo is limited to a total data size of 2GB for all databases in 32-bit mode.
      • No referential integrity
      • Data size in MongoDB is typically higher.
      • At the moment Map/Reduce (e.g. to do aggregations/data analysis) is OK,
      • but not blisteringly fast.
      • Group By : less than 10,000 keys.
      • For larger grouping operations without limits, please use map/reduce .
      • Lack of predefined schema is a double-edged sword
      • No support for Joins & transactions
      Limitations
    • Benchmarking (MongoDB Vs. MySQL) Test Machine configuration: CPU : Intel Xeon 1.6 GHz - Quad Core, 64 Bit Memory : 8 GB RAM OS : Centos 5.2 - Kernel 2.6.18 64 bit Record Structure Field1 -> String, Indexed Field2 -> String, Indexed Filed3 -> Date, Not Indexed Filed4 -> Integer, Indexed
    • Mongo data model
      • A Mongo system (see deployment above) holds a set of databases
      • A database holds a set of collections
      • A collection holds a set of documents
      • A document is a set of fields
      • A field is a key-value pair
      • A key is a name (string)
      • A value is a
        • basic type like string, integer, float, timestamp, binary, etc.,
        • a document, or
        • an array of values
      MySQL Term Mongo Term database database table collection index index row BSON document column BSON field Primary key _id field
    • SQL to Mongo Mapping Chart
    • Continued ... SQL Statement Mongo Statement
    • Replication / Sharding
      • Data Redundancy
      • Automated Failover
      • Distribute read load
      • Simplify maintenance
      • (compared to "normal" master-slave)
      • Disaster recovery from user error
      • Automatic balancing for changes in
      • load and data distribution
      • Easy addition of new machines
      • Scaling out to one thousand nodes
      • No single points of failure
      • Automatic failover
    • These slides are online: http://amardeep.in/intro_to_mongodb.ppt