Talk given before the July 22 Philippine Ruby Users Group meetup

1. MongoDB is the New MySQL
Friday, July 23, 2010

2. MongoDB is...
• a schema-less, document-oriented database
• open-source (server: GPL, drivers: Apache)
• built on C++
• supported commercially by 10gen
Friday, July 23, 2010

3. Why MongoDB?
• Fast
• Highly scalable: replication, sharding
• Open-source
• runs on Windows
Friday, July 23, 2010

4. Trade-offs
Friday, July 23, 2010

5. ACID
• Atomicity - A transaction is all or nothing
• Consistency - Only valid data is written to
the database
• Isolation - Pretend all transactions are
happening serially and the data is correct
• Durability - What you write is what you get
Friday, July 23, 2010

6. BASE
• Basically Available - system seems to work
all the time
• Soft state - it doesn’t have to be consistent
all the time
• Eventually consistent - becomes consistent
at some later time
Friday, July 23, 2010

7. memcached
Scalability & Performance
key-value stores mongoDB
RDBMS
Depth of Functionality
Friday, July 23, 2010

8. Programming
Friday, July 23, 2010

9. ActiveModel?
Friday, July 23, 2010

10. Persistence
Friday, July 23, 2010

11. Querying
Friday, July 23, 2010

12. Named Scopes!
Friday, July 23, 2010

13. Named Scopes!
Friday, July 23, 2010

14. Named Scopes!
Friday, July 23, 2010

15. Callbacks
before_create
before_destroy
before_save
before_update
before_validation
after_create
after_destroy
after_save
after_update
after_validation
Friday, July 23, 2010

16. Validation
Friday, July 23, 2010

17. Administration
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18. Replication
• M -> S
• M -> S*
• Replica sets [aka clusters] coming in v.1.6
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19. Sharding
Friday, July 23, 2010

20. Questions?
Radamanthus Batnag
rad@infinite.ly
Friday, July 23, 2010

21. Links
• http://www.mongodb.org/
• http://www.mongoid.org
• http://highscalability.com/drop-acid-and-
think-about-data
• http://www.thenetworkadministrator.com/
MongoDB_MySQL.htm
Friday, July 23, 2010