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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.

Related Terms

Partitioning
A technique of dividing large database tables into smaller, more manageable segments while maintaining a single logical table.
SQL
Structured Query Language — the standard language for managing and querying data in relational databases.
Migration
A version-controlled change to a database schema that can be applied and reversed systematically.
Stored Procedure
A precompiled collection of SQL statements stored in the database that can be executed as a single unit.
Database Connection Pooling
A technique that maintains a cache of database connections for reuse, reducing the overhead of creating new connections.
EXPLAIN Plan
A database command that shows how the query planner will execute a SQL query, revealing join methods, scan types, and estimated costs.
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