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Databases Intermediate

What is NoSQL?

A category of databases that store data in non-tabular formats, optimized for specific data models and access patterns.

NoSQL databases sacrifice some relational features for scalability and flexibility. Types include document stores (MongoDB — JSON documents), key-value stores (Redis — simple lookups), column-family stores (Cassandra — wide columns), and graph databases (Neo4j — relationships).

NoSQL databases often provide eventual consistency rather than strong consistency, horizontal scaling, and schema flexibility. They excel at specific use cases like caching, real-time analytics, and content management.

Related Terms

Time-Series Database
A database optimized for storing and querying timestamped data points like metrics, sensor readings, and event logs.
Normalization
The process of organizing database tables to reduce data redundancy and improve data integrity.
Row-Level Security (RLS)
A database feature that restricts which rows a user can access in a table based on security policies.
Database Sharding
A horizontal scaling strategy that distributes data across multiple database servers based on a partition key.
Transaction
A sequence of database operations that are treated as a single unit — either all succeed or all are rolled back.
Trigger
A database object that automatically executes a specified function when certain events (INSERT, UPDATE, DELETE) occur on a table.
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