System Design Fundamentals

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NoSQL Databases

NoSQL databases, also known as "Not Only SQL" databases, are a diverse group of non-relational databases designed to address the limitations of traditional SQL databases, particularly in terms of scalability, flexibility, and performance under specific workloads. NoSQL databases do not adhere to the relational model and typically do not use SQL as their primary query language. Instead, they employ various data models and query languages, depending on the specific type of NoSQL database being used.

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Indresh Gahoi

Indresh Gahoi

· 2 years ago

Why is Apache Casandra a column family data base, as per your document? Why is Amazon DynamoDB a key value store as per your document? It would be good if you could give an example along with modeling and query (access pattern); otherwise, your explanation is very confusing.

Jan A

Jan A

· 2 years ago

FYI, Amazon QLDB is reaching end of support by 07/31/2025.