NoSQL Databases

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A NoSQL database provides a mechanism for storage and retrieval of data which is modeled in means other than the tabular relations used in relational databases. Motivations for this approach include: simplicity of design, simpler "horizontal" scaling to clusters of machines and finer control over availability. The data structures used by NoSQL databases (e.g. key-value, wide column, graph, or document) are specified from those used by default in relational databases, making some operations faster in NoSQL. Sometimes the data structures used by NoSQL databases are also viewed as "more flexible" than relational database tables.

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A technology that is kind of a fad,but will probably last but be not as popular are the no sql databases. They have there place for certain applications, but I don't believe they will replace SQL databases. Having to know how you are going to query before you store your data is just not realistic.  
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Percona Live Europe 2017 | Sep 25 - 27, 2017
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Percona Live Europe 2017 | Sep 25 - 27, 2017

The Percona Live Open Source Database Conference Europe 2017 is the premier event for the diverse and active European open source database community, as well as businesses that develop and use open source database software.

Is it just me or is NoSQL Overapplied? It seems like in an effort to be as trendy as possible people shoehorn obviously relational problems into non relational schema. If you have to start throwing foreign keys on your objects I think you need to rethink your solution. Sarah Mei makes a good point about this in her article:

http://www.sarahmei.com/blog/2013/11/11/why-you-should-never-use-mongodb/
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Expert Comment

by:Phil Phillips
It was definitely over applied initially. Though, I think it's gotten better over the years. Part of it, too, is that a lot of the relational databases started incorporating NoSQL-like features (i.e. PostgreSQL and their JSON capabilities).
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NoSQL Databases

123

Solutions

241

Contributors

A NoSQL database provides a mechanism for storage and retrieval of data which is modeled in means other than the tabular relations used in relational databases. Motivations for this approach include: simplicity of design, simpler "horizontal" scaling to clusters of machines and finer control over availability. The data structures used by NoSQL databases (e.g. key-value, wide column, graph, or document) are specified from those used by default in relational databases, making some operations faster in NoSQL. Sometimes the data structures used by NoSQL databases are also viewed as "more flexible" than relational database tables.

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