neo4j : introduction to graph database

Neo4j:Introduction to Graph DB

Presenter: Manash Ranjan Rautray,QA,Mindfire SolutionsDate: 12/09/2014

Presenter: Manash Ranjan Rautray, Mindfire Solutions

Manash Ranjan Rautray, Software QA EngineerMindfire Solutions

Skills : WebDriver, Java, JUnit, Maven, Oracle 11G,Neo4j,Mongo DBCertifications : ISTQB Foundation Level, V-Skills Selenium Certified,MCP:70-480

Connect with Me :LinkedIn : http://in.linkedin.com/pub/manash-ranjan-rautray/60/9a5/528

Contact Me :Email :[email protected]

Skype: mfsi_manashr

About Me


The Path Forward:

What is a Graph ?

What is Neo4j ?

Building blocks of a Graph DB

Data Modelling: SQL vs Graph

Use case: Social Media

Cypher Query Language

Installation of Neo

What is Graph ?


This is a Graph


Twitter Social Graph


Internet Graph


A graph database...

2NO: not for charts & diagrams.

YES: for storing data that is structured as a graph.Remember linked lists, trees?Graphs are the general-purpose data structure.

“A relational database may tell you the average age of everyone in this session,but a graph database will tell you with whom you will be going for lunch.”


What is Neo4j?


open_source:true

language:’Swedish’

year:2007

The Property Graph of Neo4j:


Who is using Graph Databases?● Some big names using Graph Databases:○ Facebook - Open Graph Database○ Google - Knowledge Graph○ Twitter - FlockDB distributed graph Database○ Adobe○ Glassdoor○ JustDial○ CareerBuilder○ Indiatimes○ telenor○ hewlett packard○ T-Mobile○ Cisco


Why Neo4j?

● Fully Transactional (ACID)● Highly Agile● Best suited for data which is highly connected and have complex relationships.● Is supremely fast when it comes to querying connected data● Highly scalable, up to several billion nodes/relationships/properties● Neo4j allows infinite depth● Data Modeling in Neo4j :

The whole model relies on the questions we have to ask our database

Very easily done, even when designing domains in SQL we tend to make graphs on whiteboards.


Neo4j vs. Mysql● for the simple friends of friends query, Neo4j is 60% faster than

MySQL● for friends of friends of friends, Neo is 180 times faster● and for the depth four query, Neo4j is 1,135 times faster● and MySQL just chokes on the depth 5 query


Data Modeling : SQL vs. Graph


Example: YouTube in SQL

ID Name

1 Alice

2 Bob

3 Charles

4 David

ID Name

1 Bob’s Gaming Channel

2 Bob’s Cute Dog

3 Cooking with Charles

4 David’s How-To Channel

5 Disco Dancing with David

User ID

Channel ID

2 1

2 2

3 3

4 4

4 5

USERS

CHANNELSUSERS_CHANNELS

User ID

Channel ID

1 3

1 4

2 3

2 5

3 1

USERS_SUBSCRIPTIONS


User

Channel Example: YouTube in a Graphname:’David’

name:’David’s How-To Channel’

OPERATES

name:’Disco Dancing with David’

name:’Bob’

name:’Bob’s Cute Dog’

name:’Bob’s Gaming Channel’

name:’Charles’name:’Cooking with Charles’

name:’Alice’

OPERATES SUBSCRIBEDOPERATES

OPERATES

OPERATESSUBSCRIBED

SUBSCRIBED

SUBSCRIBED

SUBSCRIBED


Use Case: Social Media


Cypher Query Language● Is a declarative query language for querying Neo4j● Expressive and Human readable syntax● Matches patterns of nodes and relationships toextract/modify information in the graph● With cypher, we can create, update, removenodes, relationships and properties● Has an online console at http://www.neo4j.org/console● Has a short learning curve due to similarities withSQL query statements



Create a Node:

CREATE (n:Actor { name:"Tom Hanks",age:44 })

● Actor is the Label● n is the variable for new node● {} brackets to add properties to the node



Read Properties of a Node:

MATCH (actor:Actor)WHERE actor.name="Tom HanksRETURN actor;

● Actor is the Label● actor is the variable for node● WHERE to restrict the result to ourcriteria● RETURN the properties on the node


Question and Answer


References

http://neo4j.com/docs/milestone/

http://neo4j.com/graphacademy/?gclid=CJ_Mn56e3b8CFXNo7AodVDoAkAhttps://www.youtube.com/watch?v=7Fsfa5DP9sE

groups.google.com/group/neo4j

Thank you


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neo4j : introduction to graph database

Software

property graph of neo4j

graph databases

graph dbdata modelling

cypher query languagecreate

label actor

connected data

tom hanksreturn actor

declarative query language