Chapter 5. Consistency

One of the biggest changes from a centralized relational database to a cluster-oriented NoSQL database is in how you think about consistency. Relational databases try to exhibit strong consistency by avoiding all the various inconsistencies that we’ll shortly be discussing. Once you start looking at the NoSQL world, phrases such as “CAP theorem” and “eventual consistency” appear, and as soon as you start building something you have to think about what sort of consistency you need for your system.

Consistency comes in various forms, and that one word covers a myriad of ways errors can creep into your life. So we’re going to begin by talking about the various shapes consistency can take. After that we’ll discuss why you may ...

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