代价：两张表必须用完全一致的分片策略。如果某张表后来因为业务增长改了分片键——绑定关系断掉，全废。而且只解决一对一绑定的场景。面试官追那刀"订单表和商品表不在同一个分片键上"——就是说绑定表用不了。

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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。