Beginner 1 minute

NoSQL Databases

NoSQL is a family of databases that does not require the traditional relational table model. Document, key-value, wide-column, and graph databases each optimize different access patterns. Many offer flexible schemas and easy distribution, but they still require deliberate modeling. NoSQL is not 'no structure'; the structure is often shaped around the queries an application must serve.

Key idea

Pick a NoSQL model based on access pattern, scale, and consistency needs.

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Key

Document

Flexible shape

Fast access

Flexible shapes for fast access

Real-world example

A session store can map a session ID directly to a small document in a key-value database. A content feed may use documents shaped for fast reads instead of joining many relational tables.

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1. What does NoSQL describe?

2. What should shape a NoSQL model?