二十分钟后，客服群炸了。客户说没收到欢迎短信，销售说客户列表里搜不到人。小李自己刷新了一下后台，更诡异——数据又慢慢变多了，从 800 涨到 1600，再涨到 2400，像挤牙膏。

目前网上绝大多数教程都停留在表面：只教你执行 VACUUM、VACUUM FULL，完全不讲底层 MVCC 机制、Vacuum 阻塞根源、不同操作的风险边界。很多团队盲目操作，轻则膨胀反复复发，重则线上锁表、业务瘫痪。

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