NoSQL Introduction

NoSQL introduction The road to inﬁnite scalability Ahmed Soliman Head of Research and Development Cloud Niners Information Systems L.L.C

@AhmedSoliman

www.ahmedsoliman.com

SQL Databases == RDBMS* *yes, this a common convention

How do you scale a SQL database?

clustering partitioning sharding caching partitioning

What is a database true scalability?

Horizontal scale* *more servers creates more capacity

Transparency *business logic should be separated from concerns of scaling server resources

No Single Point Of Failure

Ok, let’s see how SQL do?

Vertical Scalability* * more capacity means bigger box

Horizontal Scalability* *aka, partitioning or sharding

Read-only slaves

So, how to solve this problem?

Simple! By redeﬁning the question :)

Is relational databases always the right solution?

Relational properties* *do you mean ACID?

Atomicity Consistency Isolation Durability

Do you “really’ need that?

You might feel that you do

Trust me, you don’t

welcome to the web scale

More than 400 million active users

Over 160 million objects (pages, groups, etc.)

More than 25 billion pieces of contents* *links, videos, blog posts, notes, photos, etc.

SQL databases cannot handle the web scale

It costs 100,000$ to setup a SQL cluster* *think of the hardware requirements

Cost is not proportional to load

Cost is not proportional to load Although it should!

So, why is that?

This will be explained in the next presentation(s)

enter the world of NoSQL

Non Relational

Key-Value store

Key = “value”

Based on DHT* *distributed hash table

document store

Schema free database

{name: “mongo”, type:”db”}

PERFORMANCE

SQL Database It takes SQL Server 2008 160 seconds to insert 50,000 rows

NoSQL Database It takes MongoDB Server 5 seconds to insert the same number of records

Man! This is REALLY fast.

Built-in Map-Reduce

Geospatial Support

Conclusion

Google, Yahoo, Facebook, LinkedIn, Twitter, Digg, etc.

Horizontal scalability

Horizontal scalability Commodity hardware

Horizontal scalability Commodity hardware High performance

Horizontal scalability Commodity hardware High performance Fault tolerance

Horizontal scalability Commodity hardware High performance Fault tolerance Eventual consistency

Horizontal scalability Commodity hardware High performance Fault tolerance Eventual consistency *optional

Horizontal scalability Commodity hardware High performance Fault tolerance Eventual consistency *optional And lots more...

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NoSQL Introduction

by Ahmed Soliman on May 15, 2010

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NoSQL Introduction — Presentation Transcript