Introduction to NoSQL and MongoDB
Introduction to NoSQL and MongoDB
Kathleen Durant Lesson 20 CS 3200 Northeastern University
1
Outline for today
? Introduction to NoSQL
? Architecture
? Sharding ? Replica sets
? NoSQL Assumptions and the CAP Theorem ? Strengths and weaknesses of NoSQL
? MongoDB
? Functionality ? Examples
2
Taxonomy of NoSQL
? Key-value ? Graph database ? Document-oriented ? Column family
3
Typical NoSQL architecture
K
Hashing
function maps
each key to a
server (node)
4
CAP theorem for NoSQL
What the CAP theorem really says:
? If you cannot limit the number of faults and requests can be
directed to any server and you insist on serving every request you
receive then you cannot possibly be consistent
Eric Brewer 2001
How it is interpreted:
? You must always give something up: consistency, availability or tolerance to failure and reconfiguration
5
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