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

Database Backup

The process of creating copies of database data to protect against data loss from failures, corruption, or human error.

A centralized repository optimized for analytical queries that integrates data from multiple operational sources.

Stored Procedure

A precompiled collection of SQL statements stored in the database that can be executed as a single unit.

A set of four properties (Atomicity, Consistency, Isolation, Durability) that guarantee reliable database transactions.

Prepared Statement

A pre-compiled SQL template that uses parameters instead of literal values, preventing SQL injection and improving performance.

A pattern where records are marked as deleted with a flag or timestamp rather than being physically removed from the database.

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