Moohanad Hassan Maedeh Pishvaei

Introduction Open Source Apache foundation project Relational DB: SQL Server CouchDB : JSON document-oriented DB (NoSQL) CouchDB database is made up collections You can think of collections as tables from relational databases Collections are made up of zero or more `documents'. You can think of documents as a row from relational databases Schema free: No need to design your tables, you can simply start storing new values Example: 1. FirstName="Bob", Address="5 Oak St.", Hobby="sailing“ 2. FirstName="Jonathan", Address="15 Wanamassa Point Road", Children=("Michael,10", "Jennifer,8", "Samantha,5", "Elena,2"). No wasting storage on empty, or null fields.

CouchDB Web Server /Application Server: Write a client side application that talks directly to the Couch without the need for a server side middle layer Having the database stored locally, your client side application can run with almost no latency. Data replication model: devices (like Android phones) that can go offline and handle data sync for you when the device is back online. Add attachments to documents Scalable and fault tolerant Use RESTful Interface to store JSON documents: Data creation/replication/insertion, every management and data task can be done via HTTP. REST=Representational State Transfer Use map/reduce query written in JavaScript Faster than SQL because of using pointers instead of joints

Querying documents Map function Key, Value All Documents Query by Key Key, Value Map function (extracting data)is executed on every document in the database Emits key/value pairs (Can emit 0, 1, or more KV pairs for each document in the database) key/value pairs are then ordered and indexed by key Query types: Exact: key = x Range: key is between x and y Multiple: key is in list (x,y,z) Reduce functions(data aggregation) e.g. count, sum, group

CouchDB GUI

Who Use CouchDB? Independet Facebook Developers Mobile Developers(iPhone, Android) Bloggers

Conclusion & More Information If your data is truly relational, stick with RDBMS CouchDB is quite low-level, but is very helpful A database designed to run on the internet of today for today’s desktop-like applications and the connected devices through which we access the internet. Tutorial: rial/index rial/index CouchDB Project: A list of organizations using CouchDB: