Russell Smith is a consultant who works with MongoDB. MongoDB is a scalable, high-performance, open source, document-oriented database that stores JSON-like documents. It is schema-less, simple, reliable, and scalable. Popular companies that use MongoDB include Foursquare, Disney, and Craigslist. The basics of MongoDB include inserting documents, finding documents, updating documents, removing documents, and ensuring indexes.

1. An introduction to MongoDB
Russell Smith

2. /usr/bin/whoami
• Russell Smith
• Consultant for UKD1 Limited,
• External consultant for 10gen
• Help with code, architecture, infrastructure, devops, sysops, capacity
planning, etc
• <3 MongoDB, MySQL, Redis, Gearman, Neo4j, Kohana, Riak, PHP,
Debian, AWS, etc

3. What is MongoDB
• A scalable, high-performance, open source, document-oriented
database.
• Stores JSON like documents
• Commercially backed by 10gen

4. Why choose it?
• Schema-less
• Simple
• Reliable
• Scalable
• Drivers

5. Who uses it?
• Foursquare
• Disney
• Craigslist
• MTV Networks
• O2
• Telefonica

6. Basics
• insert
• find
• update
• remove
• ensureIndex

7. Insert
• db.test.insert({hello: ‘world’});

8. Find
• db.test.find()
• Equivalent of SELECT * FROM test;
> db.test.insert({hello: ‘world’});
> db.test.find();
{ "_id" : ObjectId("4e7c9f464bdd7534bc498ff7"), "hello" : "world" }

9. Updating
• db.test.update(<condition>, <operation>)
> db.test.find();
{ "_id" : ObjectId("4e7c9f464bdd7534bc498ff7"), "hello" : "world" }
> db.test.update({hello:‘world’}, {hello: ‘seedhack’});
> db.test.find();
{ "_id" : ObjectId("4e7c9f464bdd7534bc498ff7"), "hello" : "seedhack" }

10. Removing
• db.test.remove(<condition>)
> db.test.find();
{ "_id" : ObjectId("4e7c9f464bdd7534bc498ff7"), "hello" : "seedhack" }
> db.test.remove({hello: ‘seedhack’});
> db.test.count()
0
>

11. Indexes
• It’s usually a good idea to index your collections
• How and which columns depends on what you are doing
• explain
> db.test.ensureIndex({hello:1})

12. More advanced
• sort, count, limit, special operators
• Capped collections
• Geospatial indexing
• MapReduce
• Replica sets
• Sharding

13. Getting started...
• Download & install - http://www.mongodb.org/downloads
• Online shell - http://www.mongodb.org/

14. Questions / Further
• Come and ask me questions
• Updates can also push, set, increment, decrement, etc
http://bit.ly/gEfKOr
• Indexes can be across multiple keys, 2D (geo) and ASC / DESC
http://bit.ly/hpK68Q
• SQL -> Mongo chart
http://bit.ly/ig1Yfj