London MongoDB User Group April 2011
Download as KEY, PDFâ˘0 likesâ˘392 views
This document provides a short introduction to MongoDB. It discusses that MongoDB is a scalable, high-performance, open source, document-oriented database that stores JSON-like documents. It then demonstrates some basic MongoDB operations like insert, find, update, remove, and indexing documents in a collection. The document recommends further resources on additional MongoDB features and capabilities.
London MongoDB User Group April 2011
- 1. A short introduction to MongoDB Russell Smith
- 2. /usr/bin/whoami ⢠Russell Smith ⢠Consultant for UKD1 Limited ⢠Specialising in helping companies going through rapid growth ⢠Help with code, architecture, infrastructure, devops, sysops, capacity planning, etc ⢠<3 gearman, mongodb, neo4j, mysql, kohana, riaksearch, php, debian
- 3. What is MongoDB ⢠A scalable, high-performance, open source, document-oriented database. ⢠Stores JSON like documents ⢠Indexible on any attributes (like MySQL)
- 4. Getting started... ⢠Try out the interactive shell at www.mongodb.org (then click try!) ⢠Download and install - http://www.mongodb.org/downloads
- 5. Basics ⢠Common things you do in MySQL or another RDBMS; ⢠Insert ⢠Select (aka ďŹnd) ⢠Update ⢠Delete (aka remove) ⢠Index
- 6. Create ⢠Creating âtablesâ, or in MongoDB terms collections, is not usually necessary ⢠Ditto for databases
- 7. Insert ⢠db.test.insert({hello: âworldâ}); ⢠This insert the document {hello: âworldâ} into the test collection
- 8. Letâs check it ⢠In MongoDB we ďŹnd documents rather than SELECTing them... ⢠db.test.ďŹnd() ⢠this is the equivalent of SELECT * FROM test; ⢠it will return the document we previously inserted
- 9. Updates ⢠Letâs update the document to say from Russell ⢠db.test.update(<documents which match>, <set to x>) ⢠db.test.update({hello: âworldâ}, {hello: âfrom Russellâ})
- 10. Delete? ⢠db.test.remove(<where documents match>) ⢠Lets remove the last document ⢠db.test.remove({hello: âfrom Russellâ})
- 11. Drop ⢠If you no longer want an entire collection, you can drop it which removes all the data and indexes; ⢠db.test.drop()
- 12. Indexes ⢠For performance itâs usually a good idea to index your collections. ⢠How and which columns depends on what queries you are doing - you can get help with this by using âexplainâ much like in MySQL. ⢠db.test.ensureIndex({hello:1})
- 13. Further reading ⢠Iâve only brushed on the details, but this should be enough to get you interested / started with MongoDB. Some of the missing stuff; ⢠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