Technical Introduction to MongoDB
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Presented at http://www.meetup.com/emerging-business-technology/events/60978812/
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Technical Introduction to MongoDB
- 1. 1
- 2. Today‟s Talk • 10gen • MongoDB • Real World Applications / Use Cases • Community 2
- 3. 10gen • 10gen began the MongoDB project • Development, support, and services • ~125 employees • New York, Palo Alto, London, Dublin • $31M+ funding (last round, Sept 2011) • Investors: Sequoia, Flybridge, Union Square 3
- 4. MongoDB MongoDB is a scalable, high-performance open source NoSQL database • Document-Oriented Storage • Replication and High Availability • Auto-Sharding • Fast In-Place updates • Ad-hoc Querying • Full index support • Map/Reduce
- 5. Database Landscape Memcached Scalability & Performance Key / Value RDBMS Depth of functionality
- 6. What‟s a document anyway? doc = { author : "roger", date : "Sat Jul 24 2010 19:47:11 GMT-0700 (PDT)", text : "Spirited Away", tags : [ "Tezuka", "Manga" ], comments : [ { author : "Fred", date : "Sat Jul 24 2010 20:51:03 GMT-0700 (PDT)", text : "Best Movie Ever" } ] }
- 7. Atomic Updates • $set, $unset, $inc, $push, $pull, … > comment = { author: “john”, date: new Date(), text: “I didn„t like it so much”} > db.posts.update( { _id: doc._id }, $push: {comments: comment} );
- 8. Querying // find posts tagged with Manga > db.posts.find( {tags: “Manga”} ) // find posts commented on by Fred > db.posts.find( {“comments.author” : “Fred” } ) // Aggregation > db.posts.find( {author: „roger‟} ).count()
- 9. Query Operators • Conditional Operators • $all, $exists, $mod, $ne, $in, $nin, $nor, $or, $size, $type • $lt, $lte, $gt, $gte > db.posts.find({tags : {$in : [“Manga”, “animation}]}) • Regular expressions > db.posts.find({author: /^r/})
- 10. Indexes // Index nested documents > db.posts.ensureIndex( “comments.author”:1 ) db.posts.find({„comments.author‟:‟Fred‟}) // Index on tags > db.posts.ensureIndex( tags: 1) > db.posts.find( { tags: ‟Manga‟ } )
- 11. Replica Sets Write Primary Read Asynchronous Secondary Replication Read Secondary Read
- 12. Replica Sets Write Primary Read Secondary Read Secondary Read
- 13. Replica Sets Primary Automatic Leader Election Write Primary Read Secondary Read
- 14. Replica Sets Secondary Read Write Primary Read Secondary Read
- 15. Write Read MongoS MongoS MongoS MongoS Key Range Key Range Key Range Key Range -∞..n1, n6..n7 n1..n2, n7..n8 n3..n4, n8..n9 n5..n6, n9..∞ Primary Primary Primary Primary Secondary Secondary Secondary Secondary Secondary Secondary Secondary Secondary
- 16. MongoDB Use Cases Content Analytics E-Commerce Management Advertising Gaming Social Network
- 17. Community • MongoDB Days • 23+ MongoDB Days reaching over 10,000 people annually • MongoNYC May 23rd • MongoBoston in Fall • MongoDB User Groups • 28 cities with MUGs • Join Boston MUG • http://bit.ly/BostonMUG • User Forum • http://bit.ly/mongodb-user • 15,000+ questions answered • Office Hours • Coming soon… Suggestions? 17