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Seedhack 2011 - Introducing MongoDB
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Russell Smith
April 20, 2012
Technology
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Seedhack 2011 - Introducing MongoDB
Russell Smith
April 20, 2012
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Transcript
An introduction to MongoDB Russell Smith Friday, 20 April 12
/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 Friday, 20 April 12
What is MongoDB • A scalable, high-performance, open source, document-oriented
database. • Stores JSON like documents • Commercially backed by 10gen Friday, 20 April 12
Why choose it? • Schema-less • Simple • Reliable •
Scalable • Drivers Friday, 20 April 12
Who uses it? • Foursquare • Disney • Craigslist •
MTV Networks • O2 • Telefonica Friday, 20 April 12
Basics • insert • find • update • remove •
ensureIndex Friday, 20 April 12
Insert • db.test.insert({hello: ‘world’}); Friday, 20 April 12
Find • db.test.find() • Equivalent of SELECT * FROM test;
> db.test.insert({hello: ‘world’}); > db.test.find(); { "_id" : ObjectId("4e7c9f464bdd7534bc498ff7"), "hello" : "world" } Friday, 20 April 12
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" } Friday, 20 April 12
Removing • db.test.remove(<condition>) > db.test.find(); { "_id" : ObjectId("4e7c9f464bdd7534bc498ff7"), "hello"
: "seedhack" } > db.test.remove({hello: ‘seedhack’}); > db.test.count() 0 > Friday, 20 April 12
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}) Friday, 20 April 12
More advanced • sort, count, limit, special operators • Capped
collections • Geospatial indexing • MapReduce • Replica sets • Sharding Friday, 20 April 12
Getting started... • Download & install - http://www.mongodb.org/downloads • Online
shell - http://www.mongodb.org/ Friday, 20 April 12
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 Friday, 20 April 12