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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

EXPLAIN Plan
A database command that shows how the query planner will execute a SQL query, revealing join methods, scan types, and estimated costs.
EXPLAIN ANALYZE
A PostgreSQL command that shows the execution plan of a query along with actual runtime statistics for performance tuning.
Materialized View
A database object that stores the precomputed result of a query, offering faster reads at the cost of periodic refresh.
ORM (Object-Relational Mapping)
A technique that lets you interact with a database using object-oriented code instead of writing raw SQL queries.
Vacuum
A PostgreSQL maintenance operation that reclaims storage from dead tuples and updates statistics for the query planner.
Crosstab Query
A query that transforms rows into columns, creating a pivot table view of aggregated data.
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