全表扫描（Full Table Scan）是数据库查询中常见的性能杀手，尤其在数据量巨大的生产环境中，一条效率低下的 SQL 就足以引发连锁性的系统故障。为从根本上防范此类风险， 百度 智能云数据库在 MySQL 内核层面设计并实现了一套全表扫描动态管控机制，实现对低效 SQL 的实时检测、灵活拦截与预警记录，将运维控制权真正交到开发者以及 DBA 手中。

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MySQL 到底是怎么管理和存储各种各样的数据呢？比如创建一张表、索引、表中的每一行数据、查询过程中临时存储的数据都存在哪里，又如何管理？ 数据最终要持久化到磁盘，其磁盘架构设计融合了复杂的存储结构和精巧的机制，本文将深入剖析其核心模块的 ...

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