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。

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