MongoDB at FrozenRails

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Introduction to MongoDB given at FrozenRails 2010.

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  • Collection (logical groupings of documents)
    Indexes are per-collection













  • blog post
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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
    13. Focus on Performance
    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’”)
    34. MongoMapper, Mongoid, et. al.
    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

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