Redis

What is Redis?

An open-source, in-memory data structure store that can be used as a database, cache, message broker, and streaming engine. Known for its exceptional performance, supporting operations with sub-millisecond latency. Supports various data structures including strings, hashes, lists, sets, sorted sets, and streams. Features persistence options, replication, and high availability. Powers real-time applications for companies like Twitter, GitHub, and Snapchat. One of the fastest databases available.

When to use it

• Ideal for caching frequently accessed data to reduce database load and improve application performance.
• Perfect for session storage, real-time leaderboards, pub/sub messaging, and rate limiting.
• Excellent for real-time analytics, job queues, and as a message broker.
• Commonly used alongside relational databases to cache query results or store temporary data.

When NOT to use it

• As a primary database for persistent data - data can be lost if not configured properly
• When you need complex queries and relationships - use a relational database
• Applications with large datasets that don't fit in memory - consider disk-based databases
• When data durability is more important than speed - PostgreSQL or MongoDB are better

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