database

When one database isn't enough. How sharding splits data across nodes, the trade-offs of different sharding keys, and the operational headaches (hot spots, rebalancing, cross-shard queries) you sign up for.

Learn how to combine data from different tables in a relational database using the four fundamental SQL JOIN types: INNER, LEFT, RIGHT, and FULL OUTER. We'll explore what each join does, when to use it, and how they differ, using clear examples and diagrams.

Dive deep into the world of PostgreSQL indexes. Understand the core mechanics of B-tree, Hash, GIN, and GiST indexes, their optimal use cases, and how to choose the right indexing strategy to dramatically accelerate your database queries.

Explore Redis, a powerful open-source in-memory data store. Learn its core concepts, why it's used, its versatile data structures, and how it delivers blazing-fast performance for caching, real-time analytics, and more.