An intro to MongoDB

1. javascript for your datajavascript for your data

2. MongoDB
Bridge the gap between key/val stores and
traditional RDBMS

3. MongoDB
Bridge the gap between key/val stores and
traditional RDBMS

4. MongoDB
the gap
● table

5. MongoDB
the gap
● table → collection

6. MongoDB
collection

7. MongoDB
collection
● BSON document

8. MongoDB
collection
● BSON document
● a set of fields

9. MongoDB
collection
● BSON document
● a set of fields
– key-value pair

10. MongoDB
collection
● BSON document
● a set of fields
– key-value pair
● key: a name (string)

11. MongoDB
collection
● BSON document
● a set of fields
– key-value pair
● key: a name (string)
● val: any basic type
– string, int, float, date, binary, array, document, ...

12. MongoDB
collection
● of BSON documents
● queryable

13. MongoDB
the gap
● table → collection
● SQL

14. MongoDB
the gap
● table → collection
● SQL → query objects

15. MongoDB
Query object

16. MongoDB
Query object
● JSON-like query representation

17. MongoDB
Query object
● JSON-like query representation
● db.users.find({ 'lastname': 'Heckmann' });

18. MongoDB
Query object
{ 'lastname': 'Heckmann' }

19. MongoDB
Query object
{ 'lastname': 'Heckmann' }
could even be an array

20. MongoDB
Query object
{ 'lastname': 'Heckmann'
, 'body.odor': 'nasty'
, 'age': { $gt: 32 }
, ...
}

21. MongoDB
Query object
{ 'lastname': 'Heckmann'
, 'body.odor': 'nasty'
, 'age': { $gt: 32 }
, ...
}

22. MongoDB
Query object
{ 'lastname': 'Heckmann'
, 'body.odor': 'nasty'
, 'age': { $gt: 32 }
, ...
}

23. MongoDB
Query object
{ 'lastname': 'Heckmann'
, 'body.odor': 'nasty'
, 'age': { $gt: 32, $lt: 65 }
, ...
}

24. MongoDB
Query object
$gt
$lt
$ne
$in
$nin
$all
$not
$size
$exists
… more

25. MongoDB
Query object
RegExp too!

26. MongoDB
Query object
RegExp too
db.users.find({ 'lastname': /eckmann$/i });

27. MongoDB
Query object
Subsets
db.users.find({ 'lastname': /eckmann$/i }, { 'age': true });

28. MongoDB
Query object
db.users
.find({ 'lastname': /eckmann$/i })
.sort({ 'lastname': -1 })
.limit(10)
.skip(10*(pageNumber - 1))
;

29. MongoDB
Query object
db.users
.find({ 'lastname': /eckmann$/i })
.sort({ 'lastname': -1 }) ← descending
.limit(10)
.skip(10*(pageNumber - 1))
;

30. MongoDB
Query object
db.users
.find({ 'lastname': /eckmann$/i })
.count()
;

31. MongoDB
● no JOINs

32. MongoDB
● no JOINs
● less normalization

33. MongoDB
● no JOINs
● less normalization
● embedded documents

34. MongoDB
embedded documents

35. MongoDB
embedded documents
{ name: 'aaron'
, scores:
[ { total: 93, class: ObjectID }
, { total: 46, class: ObjectID }
, { total: 20, class: ObjectID }
]
}

36. MongoDB
embedded documents
{ name: 'aaron'
, scores:
[ { total: 93, class: ObjectID }
, { total: 46, class: ObjectID }
, { total: 20, class: ObjectID }
]
}
think foreign keys

37. MongoDB
embedded documents
{ name: 'aaron'
, scores:
[ { total: 93, class: ObjectID }
, { total: 46, class: ObjectID }
, { total: 20, class: ObjectID }
]
}
{ _id: ObjectID
, name: 'how to be a good neighbor'
, teacher: 'mr rogers'
}

38. MongoDB
ObjectID
● unique identifier of a document
● each document has one
● auto inserted if missing

39. MongoDB
Insertion and UpdationInsertion and Updation

40. MongoDB

41. cheesy

42. Atomic OperationsAtomic Operations

43. MongoDB
$set
$unset
$inc
$push
$pushAll
$pop
$pull
$pullAll
$addToSet
$rename
Atomic Ops

44. MongoDB
IndexingIndexing

45. MongoDB
Indexing
● any property
● into embedded documents
● into arrays

46. MongoDB
Indexing
db.users.ensureIndex({ lastname: 1 })
db.users.ensureIndex({ 'body.odor': 1 })
db.users.ensureIndex({ 'body.odor': 1, age: 1 })

47. MongoDB
HTTP InterfaceHTTP Interface

48. MongoDB
HTTP Interface
● http://localhost:28017/
● http://localhost:28017/database/collection/?limit=5
● http://localhost:28017/database/collection/?filter_key=value

49. MongoDB
● Document oriented
● Schema-less
● Rich queries
● Full index support
● Atomic operations
● MapReduce
● Auto-sharding / replication / GridFS

50. MongoDB
Mongoose
● https://github.com/learnboost/mongoose/tree/1.0

51. Thank You
http://www.mongodb.org
https://github.com/mongodb
https://github.com/learnboost/mongoose
https://github.com/christkv/node-mongodb-native
http://www.mongodb.org/display/DOCS/Production+Deployments
https://github.com/aheckmann
http://twitter.com/#!/aaronheckmann