Episode 123: NoSQL
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Find out what NoSQL is and isnt.
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- Supergoop! SPF 30 Sunscreen Swipes with Zinc for Sensitive Skin
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Webapps – 15:22
- Kitten Image Bookmarklet – Replace a site’s images with Kittens (such as NSFW sites)
- Easy Bar Tricks – Cool tricks and sneaks to show your friends at the bar
NoSQL – 19:56
- What are they?
- Usually don’t require fixed table structures
- Usually used to scale horizontally
- Add more commodity nodes as opposed to adding more resources and using expensive hardware
- Why would you use them?
- Scalability
- Performance
- In certain use cases they are easier to implement
- When would you NOT use them?
- If you don’t know ahead of time how you are going to query or data
- Applies mainly to key-value type NoSQL
- Usually arguments start because people think in terms of RDBMS vs NoSQL. They are usually implemented side by side for difference use cases. It is not an all or nothing.
- If you don’t know ahead of time how you are going to query or data
- CAP Theorem
- Consistency (all nodes see the same data at the same time)
- Availability (node failures do not prevent survivors from continuing to operate)
- Partition tolerance (the system continues to operate despite arbitrary message loss)
- Cap Theorem says that a system can satisfy two of these but not all three.
- Popular DocDBs
- Key-value based
- Column oriented
- Graphdb
- neo4j
- Good at multiple relationships
- Think product categories
- User friend follow relationships
- Amazon
- Good at multiple relationships
- neo4j
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