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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

Index
A data structure that improves the speed of data retrieval operations on database tables at the cost of additional storage.
Soft Delete
A pattern where records are marked as deleted with a flag or timestamp rather than being physically removed from the database.
Schema
The structure definition of a database including tables, columns, data types, relationships, indexes, and constraints.
Cursor
A database object that enables row-by-row processing of query results, useful for operations that cannot be done in bulk.
Connection Pool
A cache of database connections that can be reused, avoiding the overhead of creating new connections for each request.
Database Backup
The process of creating copies of database data to protect against data loss from failures, corruption, or human error.
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