Data & AI
NoSQL refers to a broad category of database management systems that store and retrieve data using non-tabular models — including document, key-value, column-family, and graph formats — designed for flexible schemas and horizontal scalability.
NoSQL databases were developed to address limitations of relational databases at internet scale: when data is unstructured or schema changes frequently, or when write throughput requirements exceed what a single relational database server can handle, NoSQL systems offer compelling alternatives. Document stores like MongoDB store data as JSON-like documents, making them natural fits for object-oriented application data. Key-value stores like Redis provide sub-millisecond lookups, making them ideal for caching, session management, and rate limiting. Column-family stores like Cassandra handle massive write volumes across distributed nodes, widely used for IoT sensor data and event logs. Graph databases like Neo4j model entities and their relationships natively, excelling at social networks, fraud detection, and recommendation engines.
Example
A real-time messaging platform stores each conversation's messages as MongoDB documents, enabling flexible schema evolution as new message types (reactions, attachments, polls) are introduced without database migrations.
Related terms
SQL (Structured Query Language)
SQL is the standardised query language used to create, read, update, and delete data in relational databases, as well as to define schemas and control access permissions.
Database
A database is an organised collection of structured or semi-structured data stored electronically and managed by a database management system (DBMS) that enables efficient querying, insertion, update, and deletion of records.
Scalability
Scalability is the ability of a software system to handle increasing workloads — more users, data, transactions, or requests — by adding resources without requiring fundamental redesign of the architecture.
Microservices
Microservices is an architectural style in which a large application is built as a collection of small, independently deployable services, each responsible for a specific business capability and communicating via APIs.
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