Dedicated to original, practical tech insights—from skill advancement to architecture, front‑end to back‑end, the full‑stack path, with Wei Ge guiding you.
This article explains when to use NOT NULL versus NULL in relational database schemas, covering required fields, optional columns, unknown‑state representation, foreign keys, performance impact, versioning, data analysis, migration, default values and JSON types, with concrete SQL examples and practical guidance.
This guide explains Redis's eight memory eviction policies, their algorithms, ideal scenarios, and step‑by‑step configuration via redis.conf, CONFIG SET, or command‑line options, helping you choose the right strategy to balance performance, data safety, and resource limits.
This article dissects the Guava library to reveal how seven classic design patterns—Builder, Proxy, Immutable, Singleton, Decorator, Adapter, and Observer—are implemented in its core classes, providing clear code examples, step‑by‑step construction processes, and practical insights for Java developers.
