stud/I/2019-11-08-NoSQL/README.md

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Welcome
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NoSQL for cartographers.
Motiejus Jakštys
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Why me?
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- 2008: first full-time software job.
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- 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.
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What is a server?
-----------------
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Demonstration.
- pi
- pi-at-home.jpg
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SQL
---
- Invented > 50 years ago.
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- Technologies change, concepts remain.
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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.**
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What do we do?
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Get a big database
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$30 to about a $1M.
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Alternatives
============
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Split data across many servers!
Topology is not always needed:
- Pictures/videos.
- Stock prices.
- Sensor measurements.
Hey, No SQL!
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Sort-of-SQL
-----------
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Leave the syntax, cut out constraints.
- familiar syntax.
- more storage.
- less features.
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Hive:
```
SELECT a.foo FROM invites a WHERE a.ds='2008-08-15';
```
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Key-Value: fast & small
-----------------------
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- Different syntax
- Different features
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DynamoDB:
```
table = dynamodb.create_table(
TableName='users',
KeySchema=[
{ 'AttributeName': 'username', 'KeyType': 'HASH' },
{ 'AttributeName': 'last_name', 'KeyType': 'RANGE' }
],
)
```
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Key-Value: slow & very big
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---------------------
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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
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Storage in "the cloud" is quite cheap. People start moving.
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https://www.youtube.com/watch?v=8vQmTZTq7nw
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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/