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

EXPLAIN ANALYZE

A PostgreSQL command that shows the execution plan of a query along with actual runtime statistics for performance tuning.

An SQL operation that combines rows from two or more tables based on a related column between them.

A column that creates a link between two tables by referencing the primary key of another table.

A query that transforms rows into columns, creating a pivot table view of aggregated data.

Connection Pool

A cache of database connections that can be reused, avoiding the overhead of creating new connections for each request.

Connection String

A formatted string containing all parameters needed to establish a connection to a database server.

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