NoSQL taxonomies
There are many different categories of NoSQL database. A broad definition of NoSQL might consider everything from XML databases to cloud-based BLOB storage as parts of the NoSQL landscape. However, in practice only a few NoSQL databases are widely used, with the vast majority of developer mind share belonging to only two categories, key/value and document stores.
Key/value stores are popular because of their simplicity. Records are stored and retrieved via a key much like programmers use hash tables or dictionary structures to store data in the memory. These systems tend to be highly performant.
Document stores are arguably the most popular of NoSQL databases, driven primarily by the flexibility they offer. Documents are typically ...
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