stud/I/2019-11-08-NoSQL

Welcome

NoSQL for cartographers.

Motiejus Jakštys

2019-11-08

Why me?

• 2008: first full-time software job.
• 2009-2012: graduated Computing Science in Glasgow.
• 2014-2016: job: Amazon Web Services.
• 2016-now: job: Uber.

SQL and NoSQL are part of the job.

What is a server?

Demonstration.

• pi
• pi-at-home.jpg

SQL

• Invented > 50 years ago.
• Technologies change, concepts remain.

Power and limitation of SQL

Let's model a house on a piece of land.

• There will be always a piece of land under a house.
• SQL says you can enforce this.

They must be on the same server to enforce this constraint.

What do we do?

Get a big database

$30 to about a $1M.

Alternatives

Split data across many servers!

Topology is not always needed:

• Pictures/videos.
• Stock prices.
• Sensor measurements.

Hey, No SQL!

Sort-of-SQL

Leave the syntax, cut out constraints.

• familiar syntax.
• more storage.
• less features.

Hive:

SELECT a.foo FROM invites a WHERE a.ds='2008-08-15';

Key-Value: fast & small

• Different syntax
• Different features

DynamoDB:

table = dynamodb.create_table(
    TableName='users',
    KeySchema=[
        { 'AttributeName': 'username', 'KeyType': 'HASH' },
        { 'AttributeName': 'last_name', 'KeyType': 'RANGE' }
    ],
)

Key-Value: slow & very big

Videos or just large files? S3 is most popular.

Imaginge an infinite disk.

Cloud

"The Cloud" is just someone's servers with software.

• pi-datacenter.jpg
• datacenter.jpg
• snowball-edge.jpg

Storage

Storage in "the cloud" is quite cheap. People start moving.

https://www.youtube.com/watch?v=8vQmTZTq7nw

What next?

• Create an account in S3.
• Upload a file there.
• Share it with everyone under your domain.
• It's free!

Want to know more?

• Stanford Computer Science 101: https://online.stanford.edu/courses/soe-ycscs101-sp-computer-science-101
• Python programming introduction for everyone: https://tutorial.djangogirls.org/en/
• Cloud services: https://aws.amazon.com/