1. MongoDB
Part I

2. What is "NoSQL"?
Complement, not replace, traditional relational databases
Different ways to store large quantities of denormalized
data
Key/Value = Redis, Riak
Tabular / "Big Table" = HBase, Cassandra
Document = MongoDB, CouchDB
No schema
Map/Reduce
Easy scalability

3. RDMS is just fine
YES!
When you must guarantee transactional/ACID behavior
When you must have strict constraints
But...not when these are more important
Faster queries
Horizontal scalability
Flexible design

4. Data Modeling with SQL

5. Joins? We ain't got no stinking joins

6. Data Modeling with MongoDB

7. Beware the N+1 problem does lurk
Having no method for joining
means we could have a lot of
queries on our hands if we do
establish a large one-to-many
relationship outside of our
"User" document

8. MongoDB, BSON, and You
MongoDB does "document" storage
JSON is a popular lightweight data structure
BSON is a binary encoded serialized JSON document
Programming languages map to-from BSON easily
Most languages have a dictionary or hash

9. What does it look like?
{ "_id" : ObjectId("4d240d296266ea4ff500000a"),
"first_name" : "Nick", "last_name" : "Zalabak",
"addresses" : [
{"street" : "123 Foo Bar Ave","city": "Chicago","state":
"IL"},
{"street": "1 Mongo Blvd", "city": "Blah", "state": "CA"} ],
"social_networks" : [
{"user_id": "user1", "sn": "twitter"},
{"user_id": "user2", "sn": "facebook"}
],
"phone_numbers" : [ "123-345-1345", "555-555-5785"] }

10. How do I install MongoDB?
Go to http://www.mongodb.org/downloads
For Macs I'd recommend using Brew
brew install mongodb
For Linux, it depends on your distro
Pre-Packaged for Ubuntu/Debian
Pre-Packaged for CentOS/Fedora/Redhat
Good old source!
There are even installers for WinDoze

11. The './mongo' Console
MongoDB has a console very much like MySQL
>./mongo
> help
OK, how do I query to find my stuff?

12. The new query language you already know
MongoDB
<3
JSON
<3
JavaScript

13. SQL to Mongo Operations
SQL Statement Mongo Query Language Statement
CREATE TABLE USERS (a Number, b Number) implicit. MongoDB is "lazy".
INSERT INTO USERS VALUES(1,1) db.users.insert({a:1,b:1})db.users.find({}, {a:1,b:1})
SELECT a,b FROM users
SELECT a,b FROM users WHERE db.users.find({age:33}, {a:1,b:1})db.users.find({'age':
age=33SELECT * FROM users WHERE {$gt:33}})})db.users.find({name:/Joe/})
age>33SELECT * FROM users WHERE name
LIKE "%Joe%"
EXPLAIN SELECT * FROM users WHERE z=3SELECT db.users.find({z:3}).explain()db.users.distinct('last_name') db.
DISTINCT last_name FROM users UPDATE users SET users.update({b:'q'}, {$set:{a:1}}, false, true)
a=1 WHERE b='q'
DELETE FROM users WHERE z="abc" db.users.remove({z:'abc'});

14. The Compelling Sales Pitch