Introducing CouchDB

Introducing CouchDB Tuesday November 11, 2009 Hatem Ben Yacoub

Who am I ?

Hatem Ben Yacoub
IT Consultant
Senior Systems Architect
PHP Expert
e-Government Specialist
Energy Engineer
Open Source Evangelist
http://phpmagazine.net
[email_address] / @hatem / http://hatem.tel

How to build faster, bigger, reliable websites...

Scalability

Scalability ~== Database optimization

RDBMS … old fashion

… new fashion ??

NoSQL “ Not Only SQL”

Scaling writes & Scaling reads

NoSQL Non-Distributed databases (Redis, MongoDB, CouchDB , Neo4j, Tokyo cabinet ...) Distributed Databases (Cassandra, Hbase, Riak, Scalaris...)

CouchDB is NOT

A relational database.
A replacement for relational databases.
An object-oriented database.

CouchDB is

OpenSource Database
RESTful API
Schema-less document store (document in JSON format)
Multi-Version-Concurrency-Control model
User-defined query structured as map/reduce
Incremental Index Update mechanism
Multi-Master Replication model
Written in Erlang

Let's give it a try Ubuntu 9.10 already uses couchdb (all POSIX systems supported) Install the database server : $sudo apt-get install couchdb

Test installation

CouchDB port 5984

CouchDB Management interface (Futon)

Create database test

Firebug

Creating a document with jQuery // server respond with JSON also : // {"ok":true, "id":"323409622afb6477e7108684785256b8", "rev":"1-3182c819b0f98858c54ad920d6c44498"} // including the document id and revision, and a confirmation variable ok=true

How to request this document ? // response is also in JSON : // {"_id":"323409622afb6477e7108684785256b8", "_rev":"1-3182c819b0f98858c54ad920d6c44498", "Name":"Makkah", "Zip":21955}

What about updating ? // notice in the response we have revision changed to 2 // {"ok":true, "id":"323409622afb6477e7108684785256b8", "rev":"2-03779debc847f783493a69e61bd98560"}

What about creating a view ? // Server respond with {"ok":true, "id":"_design/render", "rev":"1-f95a9b997f1081043fda1a34be76c47e" } http://127.0.0.1:5984/test/_design/render/_show/code/480f17c996bcbd174ac64b976de47f79

Easy ?!

Why CouchDB

Easy to use data storage (NoSQL)
Easy to integrate with web applications : JavaScript, JSON
Scalability for large web applications : Incremental Replication, bi-directional conflict detection and management
Query-able and index-able
Offline by default

Who's using CouchDB ?

Relax

Ubuntu One Ubuntu : 10 million desktops worldwide

Lounge proxy-based partitioning/clustering framework

Mozilla Raindrop New messaging platform built on top of CouchDB

Thank you