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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

Data Warehouse
A centralized repository optimized for analytical queries that integrates data from multiple operational sources.
Database Proxy
A middleware server that sits between applications and databases, providing connection pooling, load balancing, and query routing.
Row-Level Security (RLS)
A database feature that restricts which rows a user can access in a table based on security policies.
Elastic Search
A distributed search and analytics engine built on Apache Lucene, optimized for full-text search and log analysis.
PostgreSQL
An advanced open-source relational database known for its reliability, feature richness, and standards compliance.
Crosstab Query
A query that transforms rows into columns, creating a pivot table view of aggregated data.
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