NOSQL databases can be categorized into 4 types: key-value stores, column family/big table clones, document databases, and graph databases. Key-value stores store data as key-value pairs and allow retrieval by key, column family databases organize data by rows and columns with variable schemas, document databases store data as documents with key-value attribute pairs, and graph databases store data as nodes and relationships. The document discusses the characteristics of each type and examples like MongoDB, Cassandra, and Neo4j.

1. NOSQL Databases
Not Only SQL Databases

2. 4 NOSQL Categories
1)Key-Value stores
2)Column Family/Big Table Clones
3)Document Databases
4)Graph Databases

3. 1)Key-Value Stores
Key Value Key ValueKey Value Key Value Key Value
Store1 Store2 Store3 Store4 Store5
Distributed Hash-Table
Ex:
Riak,
Voldemork,
Tokyo
The Value
can be
anything
and is
accessed by
providing a
key(Allow
you to store
metadata)

4. 2)Column Family/Big Table Clones
Every row has its own
schemas
Ex:
HBase,HyperTable,Cassandra

5. 3)Document Databases
Key/Value Pairs
Collection
Key/Value Pairs
Collection
Key/Value Pairs
Collection
Key/Value Pairs
Collection
Ex:CouchDB,MongoDB
JSON
Object

6. 1
2
3
Nodes of records (Entities)
Relationships(between these records)
Name : Hicham
Age : 23
Type: Knows
Time: 4 years
Properties(Key/Value Pairs Collections)
on both Nodes and Relationships
4)Graph Databases

7. Data Size
Data Complexity
1)Key-Value Stores
2)Column Family/Big Table Clones
4)Graph Databases
3)Document Databases
NOSQL Data Models