28 lines
1.8 KiB
Markdown
28 lines
1.8 KiB
Markdown
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noatcards = True
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isdraft = False
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# NoSQL
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## NoSQL introduction
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NoSQL is a collection of data items represented in a key-value store, document-store, wide column store, or a graph database. Data is denormalized, and joins are generally done in the application code. Most NoSQL stores lack true ACID transactions and favor [eventual consistency](https://github.com/donnemartin/system-design-primer#eventual-consistency) .
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## NoSQL under BASE principle
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BASE is often used to describe the properties of NoSQL databases. In comparison with the [CAP Theorem](https://github.com/donnemartin/system-design-primer#cap-theorem) , BASE chooses availability over consistency.
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- Basically available - the system guarantees availability.
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- Soft state - the state of the system may change over time, even without input.
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- Eventual consistency - the system will become consistent over a period of time, given that the system doesn't receive input during that period.
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In addition to choosing between [SQL or NoSQL](https://github.com/donnemartin/system-design-primer#sql-or-nosql) , it is helpful to understand which type of NoSQL database best fits your use case(s) . We'll review key-value stores, document-stores, wide column stores, and graph databases in the next section.
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## Source(s) and further reading: NoSQL
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- [Explanation of base terminology](http://stackoverflow.com/questions/3342497/explanation-of-base-terminology)
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- [NoSQL databases a survey and decision guidance](https://medium.com/baqend-blog/nosql-databases-a-survey-and-decision-guidance-ea7823a822d#.wskogqenq)
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- [Scalability](http://www.lecloud.net/post/7994751381/scalability-for-dummies-part-2-database)
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- [Introduction to NoSQL](https://www.youtube.com/watch?v=qI_g07C_Q5I)
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- [NoSQL patterns](http://horicky.blogspot.com/2009/11/nosql-patterns.html)
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