从一条记录如何存储开始，逐步理解数据页、B+ 树、查询优化，以及事务与锁。这里整理了《MySQL 是怎样运行的》的第 0–26 章，建议按顺序阅读。 原文以 MySQL 5.7 为主要背景。MySQL 8.0 / 8.4 的配置、数据字典、日志及优化器行为可能不同。

修订：2026-11-03。适用于 MySQL 业务系统的表结构设计；涉及 Java 类型映射的内容适用于 Java 项目。已确认规则是本专题的默认约定；待审核内容保留为候选建议。 具体项目的采用、实施和验证由采用方负责。 总体遵循规范总览的整体原则：实用、稳定、好维护。

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