graph databases
DESCRIPTION
One of the most promising areas in the world of NoSQL - graphs based storage and processing system which based on the theory of graphs. Neo4J - is, perhaps, the most popular Graph database at the moment. It provides high performance data storage and working with graphs, using various Java APIs and declarative query language Cypher. Adobe, Cisco, classmates.com, Deutsche telecom and many others are using Neo4J.TRANSCRIPT
NOSQLGRAPH DBs
APP DBs
AGENDA
GraphDatabases
Graph Databases
Leonhard Euler (1707 –1783)Swiss mathematician
Graph Databases: HISTORY
Graph Databases: HISTORY
What is Graph?
Vertice(Node)
Edge(Relationship)
Graph Databases: GRAPH
Graph Databases: WHAT IS IT?
Graph Databases: WHAT IS IT?
Joins
VS
Traversals
Good for semi-structured connected
data
1Index free-
adjacency
The underlying
storage
The processing
engine
2
3
4
Graph Databases: CHARACTERISTICS
APPs
Application: social graphs
Application: PAGE RANK
APP: Collaborative filtering
Neo4J: CHARACTERISTICS
true ACID transactions;
scales to billions of nodes and relationships;
high speed querying through traversals;
declarative graph query language;
Neo4J: who useit
Neo4J: WHO USE
Neo4J: network architecture
Neo4J: who useit
Neo4J: NETWORK ARCHITECTURE
Neo4J: architectureNeo4J: ARCHITECTURE
Neo4J: architectureNeo4J: Internal storage
Node
Relationship
Neo4J: architectureNeo4J: Internal storage
APP: Collaborative filteringNeo4J: CF
APP: Collaborative filteringNeo4J: CF
Neo4J: CYPHER
MATCH(p1:Person)-[x:RATED]->(m:PRODUCT)<-[y:RATED]-
(p2:Person)WITH
SUM(x.rating * y.rating) AS xyDotProduct, SQRT(REDUCE(xDot = 0, a IN COLLECT(x.rating) | xDot + a^2)) AS xLength, SQRT(REDUCE(yDot = 0, b IN COLLECT(y.rating) | yDot + b^2)) AS yLength, p1, p2CREATE UNIQUE
(p1)-[s:SIMILARITY]-(p2)SET
s.similarity = xyDotProduct / (xLength * yLength)
Alternatives
• GO• RESTful API• Built-in query editor and visualizer• back-end's: LevelDB, MongoDB• modularity
• No native storage(• Very raw(
