This talk is a quick comparison of some of the many relational and non relational database systems that can be used with ruby. It was given at Fosdem 2010 (http://fosdem.org) in the Ruby on Rails Developer Room.

1. A rubyist's naive comparison of
some database systems and
toolkits
Marc Lainez

2. Who am I ?

3. Ruby on rails developer

4. Agile optimist...

6. The sequel world

7. Object-relational mapping
is a programming technique
for converting data between
incompatible type systems in
relational databases and
object-oriented programming
languages. [wikipedia]

8. Active record

9. Active record
One class, one table
One object, one row

10. Active record
What i don’t like about it
what did i map again ?
migrations migrations migrations...
Too much queries...
(probably my fault, i’m lazy)
Sometimes you have to switch to sql

11. Active record
What i like about it
strongly bond to rails...
nice documentation
works with most plugins and gems...
works with most sql databases

12. Datamapper

13. Datamapper
very similar to ar

14. Datamapper

15. Datamapper
What i don’t like about it
migrations
Some plugins might not work
(thinking sphinx)

16. Datamapper
What i like about it
mapping in models
modular
strategic Eager loading
works with most sql databases
faster than ar

17. The NOSQL world

18. NOSQL
non-relational data stores
that doesn’t require fixed
table schemas, and usually
avoid join operations.
[wikipedia]

19. NOSQL and ruby
Document based db
Mongodb
couchdb
...
Key/value store
TOkyo
redis
project voldemort
...

20. NOSQL and ruby
mongodb

21. NOSQL and ruby
COUCHDB
Stores documents as json
easy to read, easy to parse, easy to send through a network
is distributed
database can exist in multiple places
EAch document is a restful resource

22. COUCHDB
Web interface

23. COUCHDB
RELAXDB

24. COUCHDB, ar-like
Stuffing
couchfoo

25. NOSQL and ruby
tokyo
key/value store
distributed (tyrant)
full-text search engine (dystopia)

26. NOSQL and ruby
tokyo
hash db
one key, one value
b-tree db
one key, multiple values
fixed-length db
access via natural number keys
table db
mimics relational db

27. Tokyo b-tree db

28. The best of both worlds ?

29. nosql in SQL
friendly

30. What do i think about all this ?

31. a few links
http://www.belighted.com
http://datamapper.org/
http://www.mongodb.org/
http://couchdb.apache.org/
http://github.com/paulcarey/relaxdb
http://github.com/paulca/stuffing
http://www.google.com/search?q=couchfoo
http://1978th.net/tokyocabinet/
http://friendlyorm.com/

32. questions ?