Databases Intermediate

What is Redis?

An open-source, in-memory data store used as a database, cache, message broker, and queue with sub-millisecond response times.

Redis stores data in memory for extremely fast read/write operations. It supports various data structures: strings, hashes, lists, sets, sorted sets, streams, and bitmaps. Persistence options include RDB snapshots and AOF logging.

Common uses include session storage, caching (reducing database load), real-time leaderboards, rate limiting, pub/sub messaging, and job queues. Redis Cluster provides horizontal scaling and high availability.

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Redis Fundamentals

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SQL for Absolute Beginners

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Related Terms

Row-Level Security (RLS)

A database feature that restricts which rows a user can access in a table based on security policies.

ORM (Object-Relational Mapping)

A technique that lets you interact with a database using object-oriented code instead of writing raw SQL queries.

The process of copying and maintaining database data across multiple servers for redundancy, failover, and read scaling.

A data structure that improves the speed of data retrieval operations on database tables at the cost of additional storage.

Full-Text Search

A technique for searching natural language text in databases using word stemming, ranking, and relevance scoring.

A situation where two or more transactions permanently block each other by each holding locks that the other needs.

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