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CompTIA® Linux+ / LPIC-1 Cert Guide: (Exams LX0-103 & LX0-104/101-400 & 102-400) by Sean Walberg, Ross Brunson

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Types of Databases

Data differs based on the application, so no one database solution fits all. However, most databases fall into one of three camps: key-value, relational, and schemaless.

Key-Value Databases

A key-value database acts much like a dictionary. The keys are the words and the values are the definitions. If you know the key you can quickly find the value associated with it. Figure 13-1 shows what a key-value database could look like. The values can be simple words, a data structure that the client can understand, or a binary object like a picture.

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Figure 13-1 A key-value database

Key-value databases can be so simple that they ...

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