MongoDB at FrozenRails
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Introduction to MongoDB given at FrozenRails 2010.
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MongoDB at FrozenRails
- 1. open-‐source, high-‐performance, document-‐oriented database Mike Dirolf • 10gen, Inc. • @mdirolf • http://dirolf.com
- 2. Non-relational Operational Stores (“NoSQL”) New Gen. OLAP RDBMS (vertica, aster, greenplum) (Oracle, MySQL)
- 3. NoSQL Really Means: non-‐relational, next-‐generation operational datastores and databases
- 4. no joins + no complex transactions Horizontally Scalable Architectures
- 5. no joins + no complex transactions New Data Models
- 6. New Data Models improved ways to develop applications?
- 7. Data Models Key / Value memcached, Dynamo Tabular BigTable Document Oriented MongoDB, CouchDB
- 8. • memcached scalability & performance • key/value • RDBMS depth of functionality
- 9. JSON-style Documents represented as BSON {“hello”: “world”} x16x00x00x00x02hello x00x06x00x00x00world x00x00 http://bsonspec.org
- 10. Flexible “Schemas” {“author”: “eliot”, {“author”: “mike”, “text”: “...”, “text”: “...”} “tags”: [“mongodb”]}
- 11. Dynamic Queries
- 12. Atomic Update Modifiers
- 14. Replication master slave master master slave slave slave slave master master slave master
- 15. Auto-sharding Shards mongod mongod mongod ... Config mongod mongod mongod Servers mongod mongod mongod mongos mongos ... client
- 16. Many Supported Platforms / Languages
- 17. Best Use Cases T Scaling Out Caching The Web High Volume
- 18. Less Good At highly transactional ad-‐hoc business intelligence problems that require SQL
- 19. A Quick Aside _id special key present in all documents unique across a Collection any type you want
- 20. Post {:author => “mike”, :date => Time.new, :text => “my blog post...”, :tags => [“mongodb”, “ruby”]}
- 21. Comment {:author => “eliot”, :date => Time.new, :text => “great post!”}
- 22. New Post post = {:author => “mike”, :date => Time.new, :text => “my blog post...”, :tags => [“mongodb”, “ruby”]} db[“posts”].save(post)
- 23. Embedding a Comment c = {:author => “eliot”, :date => Time.new, :text => “great post!”} db[“posts”].update({:_id => post[:_id]}, {:$push => {:comments => c}})
- 24. Posts by Author db[“posts”].find(:author => “mike”)
- 25. Last 10 Posts db[“posts”].find .sort([[:date, :desc]]) .limit(10)
- 26. Posts Since April 1 april_1 = Time.utc(2010, 4, 1) db[“posts”].find(:date => {:$gt => april_1})
- 27. Posts Ending With ‘Ruby’ db[“posts”].find(:text => /Ruby$/)
- 28. Posts With a Tag db[“posts”].find(:tags => “mongodb”) ...and Fast (multi-‐key indexes) db[“posts”].create_index(“tags”)
- 29. Indexing / Querying on Embedded Docs (dot notation) db[“posts”].create_index(“comments.author”) db[“posts”].find(“comments.author” => “eliot”)
- 30. Counting Posts db[“posts”].count db[“posts”].find(:author => “mike”).count
- 31. Basic Paging page = 2 page_size = 15 db[“posts”].find.limit(page_size) .skip(page * page_size)
- 32. Migration: Adding Titles (just start adding them) post = {:author => “mike”, :date => Time.new, :text => “another blog post...”, :tags => [“mongodb”], :title => “MongoDB for Fun and Profit”} post_id = db[“posts”].save(post)
- 33. Advanced Queries $gt, $lt, $gte, $lte, $ne, $all, $in, $nin $not, $mod, $size, $exists, $type, $elemMatch db[“posts”].find(:$where => “this.author == ‘mike’ || this.title == ‘foo’”)
- 35. Other Cool Stuff aggregation and map/reduce capped collections unique indexes mongo shell GridFS geo
- 36. Download MongoDB http://www.mongodb.org and let us know what you think @mdirolf @mongodb
Notes de l'éditeur
- Collection (logical groupings of documents) Indexes are per-collection
- blog post twitter