2. Twitter @cpatni

3. Architecture

4. http://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf Volume 13 / Number 6 / June 1970 Volume 13 / Number 6 / June 1970

6. READ COMMITTED may block

8. But allowed dirty reads...

9. Isolation. Really?

10. Locking Lock Escalation Read Lock Write Lock Table Lock

13. Living in a bliss

14. Until...

15. need redundancy

16. scale reads

17. scale writes

18. horizontally

19. Solutions...

20. replication to scale reads

21. cache through writes

22. expensive solution for redundancy

23. mongodb

24. Distributed database from ground up

25. replication in a minute (HA)

26. built-in cache through writes

27. replicate if you care about your data

28. sharding (scale out)

29. Effective Design

30. Domain objects rarely fit in a table row

33. join to assemble domain objects

34. mongo documents as pre-assembled domain objects

35. in place updates ($set, $push)

36. New hotness

37. Multikeys

38. Map reduce map = function () { for (var i = 0; i < this.tags.length; i++) { emit(this.tags[i], this.state == &quot;published&quot; ? 1 : 0); } } reduce = function (key, values) { var total = 0; for (var i = 0; i < values.length; i++) { total += values[i]; } return total; }

39. Capped collections

40. Geospatial

41. GridFS

42. Rubber meets the road

43. Realtime Dashboard

45. IGN Media: Editorial Generated Content

48. RESTful API

52. Meta+Level Games