6 Key-value Stores and Document Databases

This chapter covers key-value stores and document databases. Key-value stores are specialized for the efficient storage of simple key-value pairs. Parallel processing of key-value pairs has been popularized with the Map-Reduce paradigm. The Java Script Object Notation (JSON) is a textual format of nested key-value pairs. Document databases use JSON as their main data format. Last but not least, JSON is often used as a format for payload data in REST-based APIs.

6.1 Key-Value Storage

A key-value pair is a tuple of two strings [angbracketleft]key, value[angbracketright]. A key-value store stores such key-value pairs. The key is the identifier and has to be unique. You can retrieve a value from the store ...

Get Advanced Data Management now with the O’Reilly learning platform.

O’Reilly members experience live online training, plus books, videos, and digital content from nearly 200 publishers.