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Knowledge Hub

NoSQL Databases: Key-Value, Graph & More

A hub of NoSQL database directories — key-value and graph stores, other non-relational models, and the related data platforms.

23 topics•3 categories•Updated October 2026

Core NoSQL Categories

4 entries

The categories covered in detail.

01Key-Value DatabasesKey-value stores for fast lookups and caching. 02Graph DatabasesGraph databases for connected data. 03Time-Series DatabasesDatabases optimised for time-stamped data. 04Vector DatabasesDatabases for embeddings and AI search.

Official Projects

6 entries

Well-known open-source NoSQL projects.

05RedisIn-memory data store used as a database, cache and message broker. 06MongoDBDocument database with a flexible JSON-like model. 07Apache CassandraDistributed wide-column database for high availability at scale. 08Neo4jGraph database and analytics platform. 09Apache CouchDBDocument database with an HTTP API and replication. 10Amazon DynamoDBManaged key-value and document database from AWS.

Related Pages

13 entries

Neighbouring directories.

11Database SystemsDatabase systems hub. 12Cloud Data WarehousesCloud data warehouse platforms. 13Data ScienceData science hub. 14Data EngineeringData engineering hub. 15Data AnalyticsData analytics directory. 16Knowledge EngineeringKnowledge engineering hub. 17Cloud ComputingCloud computing hub. 18Artificial IntelligenceAI hub. 19Streaming DatabasesDatabases that keep SQL results continuously up to date over event streams. 20In-Memory DatabasesDatabases that keep data in memory for low latency. 21Distributed SQL DatabasesDistributed relational databases that scale horizontally. 22Cloud DBMSsCloud database management systems. 23Database Management SystemsDatabase management systems across relational, NoSQL and analytical engines.

Frequently Asked Questions

What is a NoSQL database?

A non-relational database that stores data in models other than tables, such as key-value pairs, documents, graphs or wide columns, usually for scale and flexible schemas.

When should I choose NoSQL over SQL?

When your data model is flexible, you need horizontal scale or very low latency, or your data is naturally a graph or time series; relational databases remain best for strongly structured, transactional data.

What is a key-value store?

A database that maps unique keys to values, ideal for caching, sessions and fast lookups.

What are graph databases good for?

Relationship-heavy problems such as fraud detection, recommendations and knowledge graphs.

Where do vector databases fit?

They store embeddings for similarity search and are widely used in AI and retrieval-augmented generation.